New Mineral Names*

American Mineralogist, Volume 62, pages 593400, 1977

NEW MINERAL NAMES*

Mrcnerl FLnrscHrR,Louls J. Cttnr, ERNssrH. Nrcxtl ANDADoLF pABsr

Argentocuproaurite Bracewellite,* grimaldiite,* guyanaite,+ mcconnellite* (1975) L V. Razin Minerals-natural alloys of gold and copper in Charles Milton, D. E. Appleman, M. H Appleman, E. C. T. ores of copper-nickel deposits of Noril's. Trudy Mineral. Mu- Chao, Frank Cuttitta, J. I. Dinnin, E. J. Dwornik, B. L. Ingram zeya Akad. Naak SSSR, 24, 93-106 (in Russian) and H. J Rose,Jr. (1976) Merumite, a complex assemblageof chromium minerals from Guyana. U. S. Geol. Suns. Prof. Pap., Microprobe analysesof two grains from Noril'sk and Talnakh. 887. l-29. respectivefy,gave Au 67.7,66.5:Cu 9.2, t 1.2;Ag 12 8, 19.4;pd4.2" 22:Rh4.3, -; Pb I 6, -; Pt 0.9,-; Sn -,0.5; totals100.7,99.8, with Merumite, supposedly CrrOr. HrO [Am. Mineral., 34, 339 idealizedformulae of AuuoCu'Agr?Rh6pd6and AurrAgr"Curnpd.. (19a9)]is shown to consistoffine-grained intergrowths ofeskolaite The X-ray powder pattern (8 lines)was indexedas primitive cubic (Cr,O.) (predominant) with 4 new minerals. It occurs as black with a : 4.073(2)A. The mineral is light reddish-rose in reflecred rounded grains in alluvial gravelsof the drainage basin of the light, isotropic, with no observed birefringence Reflectanceat 5g0 Merume River, Guyana. mm : 64.3 percent. VHNuo = 214(2ll-216). Negative to standard Guyanaite, CrO(OH) is orthorhombic, space group Pnnm, a etch agents, except for KCN and aqua regia. 4.857,b 4.295,c 2.958,4,Z = 2,G calc4.53; synthetic material has closelyagreeing unit-cell dimensions. Analysis on 37 mg by B.L.L Discussion gaveCr2O, 7 |.7, Al,Os4.0, Fe.O, 4.4, Mn,O3 0.98,Tiros 0.86,HrO Compositionally, the mineral is argentoanCuAu or cuproan ar- * 8 7, sum 90.7 percent.The strongestX-ray lines (21 given) are gentoan gold. The mineral can be indexedas face-centeredcubic 3.224(vvs) (t t0),2.432 (SX200), 1.719 (MSX2l I ), 1.636(SXl 2 I ), (hence cuproan argentoan gold), except for the weakest reflection 1.609(MSX220), 1.516 (MSX3l0). Color reddish-brown, golden- in the pattern reported at 1.6734 Confirmation by single-crystal brown, greenish-brown,green (synthetic). methods of this single weak extra reflection in the powder pattern Bracewellite, also CrO(OH), is orthorhombic, space group is necessaryto justify characterization as a new mineral species. Pbnm, a 4.492 + 0.003, b 9.860 + 0.005, c 2.974 + 0.002A., Z = 4, The name is unnecessary.L.J.C. G 4.45-4.48.It is isostructuralwith goethiteand diaspore.Analysis of a mixture containing 70 percent bracewellite * 30 percent eskolaitegave Cr2O.70.6, FeO, 15.1,AlrO3 6.2,V2Oe 0.64, TirO, Aurocuproite 0.17, H,O 6.9, sum 996 percent The strongestX-ray lines (14 L V. Razin (1975) Minerals-natural alloys of gold and copper in given) are 4.065(VVS) (ll0),2.648 (VSXl30),2.404 (VSXlll). ores of copper-nickel deposits of Noril'sk. Trudy Mineral. Mu- Color deep red to black, streak dark brown. The mineral has not zeya Akad. Nauk SSSR, 24,93-106 (in Russian). been synthesized. Grimaldiite, CrO(OH), and mcconnellite,CrOOCu, occur as M icroprobe analysesof two grains gave A u 6l .6, 64.5;Cu 28.4, intergrowths of tabular deep-red rhombohedral crystals up to I 28.0;Ag 0.9, -; Pd 7.1,69; pt 2.3,-; Rh 1.9,-; Bi 0.6,_; totals mm in size.Analysis of such an intergrowth (containing 80-86% 103.4,99.4, with idealized formulae of Cu,rAu,.pd, and grimaldiite) gave on 9.35 mg Cr"O"77.3, AlrOs 34.3, Fe,O,0.85, CurrAur"Pdr.The X-ray powder pattern (8 lines) was indexedas CuO 5.5, SiO,0.42, ignition loss 11.5,sum 999 percent.X-ray primitive cubic with a: 3.862(2)A.The mineral, foundin ores of study shows that both minerals are rhombohedral, spacegroup the Talnakh deposit,is light orange-yellowin reflectedlight, iso- R3m Grimaldiite has a 2.973 + 0.002,c 13 392 + 0.01A; mccon- tropic, with no birefringence observed. Reflectance at 580 nm : nellite has a2.983t 0.004,c 17.160+ 0.031A. The strongestlines 63 I percent. VHNuo = 199(189-206).Negative to standard etch ior grimaldiite (14 given) are 44'l (VVSX003), 2 401 (VSXOI2), reagents except for KCN and aqua regia 1.857(VSX0l5), 1.486(MSX009); for mcconnellite,the strongest Discussion Iines (14 given) are 2.860 (006), 24'14 (012),2.213 (104), 1.650 (018), 1.492(l l0). Theseboth agreewith data in the literatureon Compositionally the mineral is palladianAuCu or auroan palla- syntheticCrO(OH) and CrOOCu. dian copper. The powder pattern may be indexed as face centered Synthetic grimaldiite has been reported in the literature to have cubic (hence auroan palladian copper) except for the weakest a 2.155, e 1.975,G 4.11, 4.12. Optical propertieswere not mea- reflection at 1.0704. Confirmation by single-crystal methods of sured for mcconnellite;it has G meas(synthetic) 5.49, calc 5.61. this single extra weak reflection in the powder pattern is necessary Guyanaite is named for the locality, bracewellite for Smith to justify characterization as a new mineral species.The name is Bracewell,formerly director, British Guiana Geological Survey, unnecessary. L.J.C. who first describedmerumite, mcconnellitefor Dr. R. B. McCon- nell, former director, British Guiana Geological Survey, grimal- * Minerals marked with an asterisk after the name were ap- diite for Dr. Frank S. Grimaldi. former chief chemist.U.S. Geo- proved before publication by the Commission on New Minerals logical Survey. Type material is at the Smithsonian Institution, and Mineral Names, International Mineraloeical Association. Washington,D.C. M.F.

593 594 NEW MINERAL NAMES

Kankitet Y : b, Z 1. a 2-4o, elong.pos., pleochroicwith X and Z colorless to pale purple, abs. X I Z { Y F. Cech,J Jansaand F Novak (1976)Kankite, FeAsO,'3112 The first sample forms the core of a zoned single crystal, the HrO, a new mineral. NeuesJahrb. Mineral Monatsh.,426-436. outer part being brown manganoanzinnwaldite, from a druse of Analysisby M. Mrazek gaveAs,Ou 43.92, SO3 0.44, FerO.3l.84, granite pegmatiteat Tanakamiyama,Japan, associated with topaz, CaO 0.02, H,O + 13.91,H,O - 9.91, insol.0.36, sum 100.40 black tourmaline, albite, and quartz. The secondis a pseudohexa- percent (given as 100.46), corresponding to 2FeAsO. 6.74 H"O. gonal crystal, 3 cm across and I cm thick from Tawara, Gifu Spectographicanalysis showed traces of N, B, Cu, Mg, Mn, Ti, Prefecture, associated with cassiterite, top^z, black tourmaline, and Zn. The DTA curve shows 2 endothermicpeaks at 190 and albite, and quartz. 29O" and an exothermic peak at 605o. The loss in weight is 9.0 Unit-cell determinationsand opticson 8 lithium micasshow that percent at 200', 23.81 percent at 500'. The infrared absorption complete solid solutionsexist in the title ternary system. spectrumis given.The mineral is insolublein water, but dissolves The name is for Dr. Kazunosuke Masutomi, amateur miner- readily in l0 percentHCl. alogist and mineral collector.Type material is preservedat Kana- X-ray powder data (51 lines) are given; the strongestare 12.8 zawa Univ (anal. l) and at Tohoku University (anal.2). M'F. (l00xll0),7.56 (25)(001), 7.22 (2txi0l), 6.97 (l9x0ll), 4.764 (14x3r| ). 4.258 (2s)(r40). 3.697 (228)(42t. t4t). 2 630(29X631 ). 2553(22)(550,63t),2.520 (2lx0l3). These are indexed on a Nakauriite* monocliniccell with a 18.803,b 17 490, c7.633A, 0 92.7 1", Z ='16, Juiin Suzuki,Masahira lto and Tsutomu Sugiura(1976) A new C calc 2.732,meas 2.70 (pycnometer). .opp", sulfate-carbonate hydroxide hydrate mineral, The mineral forms yellowish-greenbotryoidal coatings and (Mn,Ni,Cu).(SO').(CO3)(OH)6.48H,O, from Nakauri, Achi crusts severaltenths mm to 7 mm thick. Luster dull. H 2-2 1/2, Prefecture, Japan. J. Japan Assoc Mineral Pettol' Econ. Geol., fracture uneven Mean n about 1.666,birefringence about d02, 71, t83-192 (in English). fi bers are length-fast The mineral was found in old dumps ( I 3th to Chemical analysiswas made of a mixture of the mineral with I sth century) near Kank, Kutna Hora district,Czechoslovakia It chrysotile,from which it could not be separated.Examination by is an alteration product of arsenopyriteand is associatedwith X-ray fluorescenceand electron microprobe analysis showed that quartz, scorodite,pitticite, gypsum, and a new mineral with for- the mineral did not contain Mg or Si; these were deducted as mula Fe3+(AsO.),(SO.XOH) I 5H,O. chrysotile,(about 607oof the sample), leaving FerO' 0.06, MnO The name is for the locality. The mineral was compared with 0.09,CuO 32.12,ZnO 0.03, NiO 0.88, SO, 16.23,CO,2.28,H2O+ ferrisymplesite(Dana's System,7th Ed., vol. 2, p. 753); type mate- 45 31, H,O 3 0l percent, corresponding to Cu(SOn).(COs) rial of the latter was amorohous to X-ravs. M.F. (OH)u.48HrO. DTA curves show strong endothermic breaks at 330o and 396' and weak ones at 78", 150', and 186' X-ray powder data (34 lines) are given for Type I and Type Masutomilite* * II crystals For Type I the strongestlines (those marked may Kazuo Harada, Mariko Honda, Kozo Nagashima and Satoshi be in part chrysotile):7.314*(100),(200); 7.081(la)(102); 4840 Kanisawa (1976) Masutomilite, manganeseanalogue of zinn- ( IaX300); 3.936(14)(222,023.312),3.652*(20X400); 3.ss2(I 3)(40 I )' waldite, with special reference to masutomilite-lepidolite- 2.3e7(t 0QaT: 2 367(|6)(s0a); 2.332 (14)(602) ; I 9I 5 ( I 6X7I 3); zinnwaldite seriesMineral J. (Japan), 8, 95-109 (in English)' For typeII, 7823(l2Xlll); 7.308*(100X200); a.827(12)(12t); 3 929(l4X30l); 3.654*(26)(310,122);2.36s (10X026). These are Analyses of masutomilite gave SiO, 46.85,47.67; AI,OB 19.81, indexed by A Kato on an orthorhombic cell, with a 14.585,b 22 l7',TiO"0. 13,0.09; FeO,0 38,0.35;FeO 1.53,l.l2; MnO 8.12, 11.47,c 16.22A, Z : 2, G (calc) 2 35,(meas)(flotation in Clerici 4 27: MeO 0.00, 0 02; Li"O 4.45,5.78;CaO 0.00, 0.08;Na,O 0 54, solution)239 +0.O2 0 6l: K,O 9 88, 9.78; Rb,O 1.54, 1.20;F 7.04, 6.84 HzO -t 1.27, The mineral is clear sky-blue. It occurs as aggregatesof slender 1.95;H,O - 1.36,0.45; sum 102.90,102.38 - (0 : F,) 296, to fibrous crystals lessthan 0.2 mm long, 0 006 mm wide. Optically 2.88 : 99.94, 99.50 percent. These correspond to the formulas biaxial, negative2V 65"(calc),a (Na) 1.585,B | 604,7 1.612, (K,Na,Rb o"(Lir rnMno reFd|8Fefi+06Al1 16)(Si,Al)sO1, 64(F,OH y ), )4 elongationpositive, pleochroic, X colorless,Y very light greenish- and (K,Na,Rb), n,FefrlaFe8+o,Al' o?XSi,Al)s)r,,?(F,OH), "r(Lir,'Mno "', blue, Z pale sky-blue to very light blue. The infrared absorption i e. the Mn-analogue of zinnwaldite,with Mn2+ ) Fe'+. spectrumis given.Type I occursas veinscutting massiveserpentin- X-ray mineral to be monoclinic, spacegroup Cm data show the ite; it is associated with chrysotile and magnetite, rarely with or C2/m, unit cells corresponding to the 2 analyzed samples re- brochantite and malachite. Type 2 occurs along fractures in spectively b 9.085,9.087; c 10.107,100904.; a 5253,5248: B shearedserpentinite, associated with chrysotile, magnetite, artinite, 100.15",100 10",Z : I ThestrongestX-ray lines(33given) of the and pyroaurite material of the first analysisare 10.10(72)(001); 3.64 (43XTl l2); The name is for the locality. M.F. 3.35(6sX022); 3.32 (100X0003); 3.09 (s8Xll2); 2.589 (46)(200, l3l); 1.982(46X005). The first sampleis pale purplish pink, transparenteven in thick Petrovicite* flakes H 2.5, G 2.94. Cleavage perfect. Optically biaxial, {001} Zdenek Johan, Milan Kvacek and Paul Picot (1976) Petrovicite, negative,2V= 29-31",a 1.534,01.569,1 1.510, r ) u veryweak, Cu,HgPbBiSeu, a new mineral Bull. Soc. fr. Mineral Christ' pleochroicwith X and Z colorlessto pale pink, Y purple, abs.X ( allogr,99,310-313 (in French). Z 1 Y, elongation positive, Y : b, Z:a 3". The second sample is purple, translucent in thick flakes H 2.5-3, C 2.90, optically Microprobe analysesby E. Joseph and R. Giraud, using Cu, biaxialneg., a 1.536,P 1.570,1 1.571,2V:28', r ) u veryweak, HgS, PbS, Bi, and Se as standards,gave Cu 16.0, l5'3; HglT'4, NEW MINERAL NAMES 595

179; Pb 16.7,17.3:Bi t6.6,17.4; Se 34.4,326;sum l0l.l, 100.5 204 6(195.4-2t38), VHN5. : 188.9(173.6-204.6),VHN,oo = percent, : correspondingto Cu:Hg:Pb:Bi:Se 2.97:1.02:0.95: 198.2(195.8-200.6),VHN,oo : 183.4(180.5-186.3)for No. 35; and 0.93:5 l3 and 2.91:1.08: l.0l: l.0l:4.99 VHN,' : 163.3(159.7-165.8), VHN5' : 178.7(161.0-199.2)for Weissenbergand rotation photographs showed it to be ortho_ No. 27. The minerat is negative to standard etching reagents, rhombic, spacegroup Pnam or Pna2,,a l6.lj6 + 0 005,b 14.6g4+ except for KCN and sometimes with aqua regia (after I min). 0.005, = c4.331 + 0.0034, V 1029A3,Z: 4,G calc 7.707.The Samples of the mineral are preserved in the Mineralogical Mu- strongest X-ray lines (27 given) are 3 621(7) (330), 3.546 (8) (420), seum, Academy of Sciences,Moscow, USSR. 3.f86 (8) (l3l), 3.120(10) (430),2.961 (10) (520,401),2120 (s) (440), 2.262(5) (61I ), 2.l0e (s) (r6t), 2 06r (s) (r22,26r). Discussion Petrovicite is cream-colored with strong metallic luster in re- The authors refer to the work of Johanssonand Linde (1936, flected light. Reflectancesare given at l5 wave lengths: 4g0 nm, Ann. Physik., 25, l-48) lor comparison with a presumed Cu.Au, 45.7 percent;540, 465 (max.); 580, 46.2;660,457. Weakly an- synthetic phase.Hansen and Anderko (1958, Constitution of Binary isotropic, with polarization colors dark green to violet. The mineral Alloys, p. 199), however, state that Johansson and Linde were polisheswell. Microhardness102 kglsq. mm (- 3 Mohs). Cleav- unableto find any clearindication of CurAu, as a distinctphase by age poor, parallel to flattening of crystals X-ray investigationsHansen and Anderko further statethat recent The mineral forms tabular crystalsup to a few tenths mm in size investigationsby severalother authors, usingeither X-rays, resis- in hydrothermal dolomite-calcite veins of the petrovice deposit, tivity, emf, or combinations,found no support for the existanceof western Moravia, Czechoslovakia. It is almost completely replaced CurAu, as a separate phase. In view of the lack of single-crystal by umangite and eskebornite;l2 other selenidesoccur in the de- data for this mineral,its indexingmust be consideredtentative, but poslt ifany likenessto syntheticphases is to be made,it must rather be The name is for the deposit.Type material(2 polished sections) to CuAu(ll). It can be also demonstratedthat the one complete are in the Ecole Natl. Superieuredes Mines, Paris. M.F. analysis given may be recalculatedon the basis of 2 atoms to give (Cu,Rh,Ni,Bi,Ag),oo, (Au,Pd)0,,. or, simply CuAu. Rozhkovite = palladian cuproauride

L. V Razin,A I. Gomonova,V. P. Bykov and V. I Meshchan_ L. V. Razin (1975) Minerals-natural alloys of gold and copperin kina (1971)A new natural intermetallideofgold, copper,and ores of copper-nickel deposits of Noril'sk. Trudy Mineral. Mu- palfadium from ores of the Talnakh deposit. Zapiski VsesMin- zeyaAkad Naak SSSR, 24,93-106 (in Russian) eral. Obshch.,100,66-'16 (in Russian) The mineral described as palladian cuproauride by Razin et al. Microprobe analysesof five grains gave a range in composition (1971) is now referred to as rozhkovite with a footnote that the and (average) for Au 60.8-65.6(61.8);Cu 23.0-28.4(249); pd name rozhkovite was consideredand recommendedby the Com- 7.t-8.6(7 6); Rh I .9-3.4(2.5 ); Pt 0.0-2.3( I .9); Ag 0.6-0.9(0.7);and mission on New Minerals and Mineral Names, I.M.A., in May Bi 0.6-0.8(0.6).Another sample(No.2) gave Au 65.6, pd 7 l. Rh 1970 3.4, Ag0.6, Bi 0.6,Ni 0.I 5, Cu 23.0,toral 100.45,which the aurhors Discussion calculated on 5 atoms to (Cur r."Pdo.lrRho rorAgoorrNio orr)(Au, ouu Bioo"). X-ray powder data (24 lines) were indexedas orthorhom- The uncertaintiesregarding the ideal composition of palladian : : : bic with a 3.86(l), D 39.00(l),rc 3.84(l)A when indexedas cuproaurideand the indexing of its powder pattern apply equally : for syntheticCuAu(II), and with c 3.88(l), b = 42.68(l),,c: to rozhkovite. The unexplainedappearance of this secondname 3.84(l)A when indexedas for syntheticCu.Aur. four years later has created an unfortunate and confusing prece- The mineralwas found in the sulfideores ofthe Talnakh deposit, dent. Though the text and Table 2 show the mineral to be ortho- consistingmainly of talnakhite, chalcopyrite,and cubanite. It is rhombic, tetragonal cell parametersare given in Table 3. Both frequently intergrown with gold alloys, native gold, and minerals namesare unnecessarypending reexaminationand better data for such as zvyagintsevite,polarite, Pt-Fe, galena, sphalerite,and characterizationas a unique mineral species.L.J.C, rarely sperrylite The mineral occurs mainly as irregular grains l-lOpm in size,but it has been found up to 0.25 X 0.45mm In reflected light the mineral has a pale rose color with lilac or red Senegalite* shade. Birefringence is sometimes observed(rose to rose-gray), and Zdenek Johan (1976) La senegalite,Al,(PO4)(OH)3.H,O, un it is variably anisotropic from grain to grain and in differently nouveau mineral. Lithos, 9, 165-17| oriented sectionsof a singlegrain. The color under crossednicols varies from bright to very weak, Microprobe analysisby E Josephgave P,Ou3l 83, Alroj 46.23, (HrO changesfrom yellowishto dark gray, and sometimeshas reddish- Fe,Or 0 28, HrO 21.00,sum 99 34 percent, by thermal analy- brown tints. The mineral tarnishes brown a few days after polish- sis), corresponding closely to the formula above. The DTA curve showssmall endothermic ing. Reflectance measurements with a pyrite standard for sample breaksat 250oand 370' and a very large one at 440'. The product gave No 2 gave:460nm46 0, 49.6;480nm 46.9, 50.5:500nm 49.0. 52.8: final of dehydration the X-ray pattern (tridymite 540nm 53.0, 57.1;580nm 59.0, 63.5; 620nm64.0, 68.5; 660nm 67.4. of AIPO. type). The infrared spectrum shows presence 7l 6; 700nm 72.4,76.4;and 750nm 76.2,80.5 Valuesare alsogiven the of hydroxyl and HrO. up to I l00nm. Microindentation hardness gave VHNro = X-ray study (Weissenbergand rotation) showed the mineral to be orthorhombic, Pna7,, a 9.678,b 7.597,c 7.668 (all + 0.002A), Z = (meas) 'The 4, G(calc)2.551, 2.552 + 0.007.Goniometric data are in authorsreport this as b/10 = 3.900). closeagreement. Forms present (100), (001), (010), (l z 4 c b lz l0), / The authorsreport this asb,zl I = 3 88fl) (210), h (01l), e (502), p (l I l). The strongest x-ray lines (42 given) 596 NEW MINERAL NAMES ares.4r (7x011), 4089 (9X201), 3.834(10X002), 3.610(8X211), Unnamed (Cu,Ni,Fe,Co)3So 2.990(9)(220), 2.348 (8Xll3, 312),2.070 (1)(123,322), t.sos M. E McCallum, R. R. Loucks, R. R. Carlson, E. F. Cooley and (7X143, 342, 404). T A. Doerge (1976) Platinum metals associated with hydro- Crystals are colorlessto pale yellow, luster vitreous H.5.5. Cleav- thermal copper ores of the New Rambler mine, Medicine Bow age { I 00} imperfect, observed only under the microscope. Not fluo- Mountains, Wyoming. Econ. Geol., 71, 1429-1450. rescent.Optically biaxial, positive, rs (Na) a 1.562,0 1.566,t 1.587(all + 0.002),2V 53 + 4o (meas),48o(calc), dispersion r ) u, A pale gray-white, optically isotropic mineral enclosedin and py- weak..Z=a.Y:c. scattered along the margins of granoblastic secondary The mineral occurs in the zone of oxidation, Kourondicko iron rite-marcasite massesoccurs in disseminated sulfide ore. Eleclron ore deposit, Senegal,associated with turquoise, augelite, wavellite, probe analysesof a homogeneousgrain showed that Cu ) Ni ) Fe and crandallite. ) Co with a stoichiometry very near (Cu,Ni,Fe,Co)rSr. The name is for the country of origin. Note-Bolivarite is the Discussion 5HrO analogue.M.F. May be a new mineral. X-ray data and quantitativeprobe data are required.L.J.C. Sugilite*

Nobuhide Murakami, Toshio Kato, Yasunori Miura and Fumi- Unnamed hydrous magnesiumcarbonate toshi Hirowatari (1976) Sugilite, a new silicate mineral from lwagi Islet, southwest Japan Mineral. J. (Japan),8, ll0-l2l (in Jujin Suzuki and Mashahiro Ito (1973) A new magnesiumcar- English). bonate hydrate mineral, Mg"(CO.).(OH),'8HrO, from Yoshi- kawa, Aichi Prefecture, Japan. J. Japan Assoc. Mineral. Petrol Recalculationof an analysisby N. M. and H. Mitsunaga of a Econ. Geol.. 68. 353-361. sample estimatedto contain 8.1 percent pectolite gave (all CaO allottedto pecrolite)sio, 71.38,Tio, 0.51, Al"os2.97,Fezos 12.76, Analysis of material containing chrysotilegave SiO, 5.01, MgO - FeO 0.19, Li,O 3.14, Na,O 4.37, K2O 3.'76,H,O + 0.81, H,O - 38.38.CaO 0.12, FezOg0.21, CO, 28.93,H,O + 20.90H,O 6.39, 0.12, sum 100.06percent; corresponding to KouNa,orliz,zFeSloe sum 99.94 percent. After subtracting SiO, as chrysotile, the analy- Fe?1u,Alou"Tio o.Si, ooO2"un(HrO)o This is formulated, in accord sis givesMgO : CO, : H,O = 5.09:4.04: 8.81 HrO, correspondingto ", with the X-ray data, as a member of the osumilite group as: the formula above (a hydromagnesite* 4HzO). The mineral is (Koe,Nao'r) [Nao"o(HzO)or,](Fe, rrNaou"Tioo.)(Lir rrAlourF%.*) slightly soluble in water. The DTA curve gives endothermic breaks Si,rO.o. Infrared study showed the absenceof hydroxyl at 40o, I 14",270",410o, and 5l5o and exothermicbreaks at 495o, Hexagonal, space group P6/mcc, a 10.007, c 14.000A, Z = 2. 637" (chrysotile),and 808' (chrysotile).The DTA pattern above The strongest X-ray lines (36 given) are 432 (100X2020),4.06 I 50' is like that of hydromagnesite. The infrared absorption spec- (s7)rr22),3.le (8r ) (2r3t),2.876b (5rX3030), I 124). trum is similar to that of hydromagnesite.The X-ray powder The mineral occurs (3-87o) as aggregatesof subhedral grains in pattern ofthe mineral hasstrongest lines (44 given) 33.2(62),16.36 aegirine syeniteforming a small (0.20 X 0.15 km) stock in Late (33), 10.S2(55), 6.454(55) (plus nesquehonite),5.887 (100), 4.206 Mesozoic biotite granite, N.E. Iwagi Islet, Ehime Prefecture, Ja: (38), 2 933 (57).After beingheated to 150o,the mineralgives an X- pan. Associated minerals are albite, aegirine, pectolite, an uniden- ray pattern close to that of hydromagnesite. The mineral occurs as tified K-Ca-Ti-silicate, sphene, allanite, andradite, zircon, and snow-white to gray oolitic, botryoidal, or reniform aggregates. apatlte. Scanning electron microscope photographs show that it consistsof Color light brownish-yellow,nearly colorlessin section Luster aggregatesof flaky crystals. vitreous. Cleavage {0001} weak. G 2.74, calc 2.80, H 6-6 1/2. Under the microscope,very fine-grained,colorless, a 1.515,0 : Optically uniaxial, neg.,o 1.610,e 1.607. |.521, 7 |.522, 2V 44.5", extinction nearly parallel,elongation The name is for ProfessorKen-ichi Sugi (1901-1948),Japanese positive. petrologist, who first found the mineral. Type material is at Yam- aguchi University, National Museum (Tokyo), Sakurai Museum Discussion. (Tokyo), and SmithsonianInstitution, Washington, D.C. M.F. Nor certainly distinct from dypingite 155,145'1-1465(1970)l; the latter is however optically biaxial positive. It occurs on the weath- ered surface of a brucite-bearing serpentinite mass. Associated Unnamed AgnPdsTe. minerals are chrysotile, nesquehonite, brugnatellite, pyroaurite, Louis J Cabri and J. H. Gilles Laflamme (1976)The mineralogy artinite, and hydromagnesite.M.F. of the platinum-group elementsfrom some copper-nickel deposits of the Sudbury area,Ontario. Econ Geol.,7l, 1159-1195.

Two grains of this unknown Ag-Pd telluride occurred in a Unnamed dimorPh of lazurite microvein of sperrylite, kotulskite, and hessitewithin chalcopyrite A. P. Sapozhnikov and V. G. Ivanov (1976) Occurrence of a from Levack West mine, Sudbury, On- and silicates in a sample triclinic (pseudo-orthorhombic) modification of lazurite' The mineral is gray with brownish tones, not bireflectant, tario. Soueshch. Molodykh Llchen. Mineral' Geokhim., Prtmorsk Ot- weakly anisotropic (air) and weakly bireflectant, anisotropism del.. Vses Mineral Obshch.,Dal'neuosl. Geol. lnst., Vladivostok, weak to moderate, with colors from dull reddish-brown to ex- 8l-82 (in Russian). tinction-(oil) Electron-probeanalyses gave: Pd 25.2,Ag 33.6,Te 40.1, As 0.29, total 99.19 percent, corresponding to A samplefrom the lazuritedeposits of Cis-Baikalhas ns a 1.503, Agr rrPdue2Tea ee, the As being assigned to contamination from B L510, t 1.514,biaxial positive,2V 62" (Note-the ns correspond adjacent sperrylite. L.J.C. to a negativemineral, M.F.). Color, pale green to dark blue; deeply NEI4/ MINERAL NAMES 597 colored varieties are strongly pleochroic with absorption Z > y > Unnamed nickel-bismuth telluride X. Oscillation and rotation photographsled to a unit cell with a T. A. Hakli, E. Hlnninen, Y. Vuorelainen and Heikki Papunen : : : 9.08 + 0.01,b 12.85f 0.01,c 25.70+ 0.024,a B = 7 = : (1976) Platinum-group minerals in the Hitura nickel deposit, 90' (ao 4cur, bo : 4* xf2, co = 2a.u6 xV2). All gralns are Finland. Econ. Geol . 71. 1206-1213. twinned, some show complex polysynthetictwinning The compositionis statedto be similar to that of cubic lazurite A mineral that optidally resemblesmelonite in the Hitura deposit, Finland, was analyzedwith the electronprobe: Ni 20.1, Pd Discussion-Data insufficient as to composition and symmetry; X- I I, Te 61.6, Bi 16.1,Sb 0.5, total 99.4 percent,corresponding to ray powder data are not given. M,F. (Ni4 s6Pdo,u)) = 5.01 (Te.,rBi, o"Sboou) > : 8 00 (recalculatedby L.J C.) Unnamed lead-bismuth tellurides Discussion A G. Lipovetskii, Yu. S. Borodaev and E. N Zav'yalov (1976) Until more preferably New lead-bismuthtellurides of the Alekseevore prospect(Sano- extensiveanalyses are made, with synthetic standards,the proposed stoichiometrymay be treatedwith voy Range) Geol.Rudnykh. Mesotorozhdanir,lll-ll5 (in Rus- caution. X-ray data also needed.The mineral may slan). be bismuthian and palladian melonite L.J.C. Quartz veins in Archean granitic rocks contain pyrrhotite and other sulfides,with small amounts of gold, hessite,altaite, tell- (Bi,Sb) urobismuthite,and tetradymite,and 4 minerals: Unnamed Pdu ,Teo Electron microprobe analysesgave: M E McCallum, R. R. Loucks, R. R Carlson, E. F. Cooley and T A Doerge (1976) Platinum metals associatedwith hydro- Ag Pb Bi Te S Sum thermal copper ores of the New Rambler mine, Medicine Bow Mineral A | 2 l3.o 40.2 44.s I ,n Mountains, Wyoming. Econ Geol.,7l, 1429-1450 Mineral B 1.3 20.5 33.1I 43.0 97.9 A pale apricot-yellow, moderately anisotropic mineral is re- MineralC 10.7 52.2 30.9 5.5 99.3 ported to correspondclosely to Pdr(Bi,Sb)rTen.It occurs as anhe- MineralD 20.3 460 27.3 6.3 99.9 dral grains, 50-250 microns across,enclosed in chalcopyriteand Thesecorrespond respectivelyto the formulas: (Ago,rPborrBir,")Ter., supergenereplacements of chalcopyriteand pyrrhotite (Ago,.Pb, ,rBi, ,r)Te., (PbouoBi, ar)(Te, ,rS, ur), and (pbo,rBi, ,u) (Tero.Sr"r). Reflectancesare given for Minerals A, B, and D, Discussion X-ray powder data for Minerals A and D. Insufficient data to assesswhether the stoichiometry is realistic. Mineral A is similar in optical propertiesto tellurobismuthite, No X-ray or analyticaldata are given. L.J.C. but the reflectanceis lower (5'7-65%).It has a pale cream tint. Cleavage{001} perfect, microhardness 65-80, av 75kglsq mm. The strongestlines of the palten(22 given) are 3.21(10), 235 (5),2.21 Unnamed Pd-Bi-Te mineral (3); the data resemble those published for synthetic pbBLTer. M. E. McCallum, R R Loucks,R. R. Carlson,E. F. Cooleyand Mineral B was found as a grain 0.1 mm., bordering mineral A. It T A Doerge (1976) Platinum metals associatedwith hydro- resemblesmineral A in appearanceand optics, but has a slightly thermal copper ores of the New Rambler mine, Medicine Bow lower reflectance.Mineral C occurs as veinlets 0.05 mm wide Mountains, Wyoming. Econ. Geol., 71, 1429-1450. associatedwith gold and tellurobismuthite. It has a light gray A light color, with a slight greenish tint. Mineral D is light gray with coffee-brown, extremely anisotropic Pd-Bi-Te mineral whose stoichiometryhas not slightly greenish tint Reflectance48.5-53 percent, and it differs in been determinedoccurs as thin rims replacingmichenerite in weakly oxidized ore. L.J.C. dispersion of reflectancefrom tetradymite. Cleavage {001} perfect, microhardness 40-65, average 5l kglsq mm Birefringence weak; anisotropicwith color effectin pale brownish-red.The strongestX- Unnamed Pdu(Te,Bi,Sb)t ray lines (34 given) are 3.09 (10),225 (4),2 12 (4), I 304 (4); the pattern somewhat resemblesbut differs from that of ioseite-A. M. E. McCallum, R. R. Loucks,R. R. Carlson,E. F. Cooleyand M.F. T. A. Doerge (1976) Platinum metals associatedwith hydrothermal copper ores of the New Rambler mine, Medicine Bow Mountains, Wyoming Econ. Geol., 7l 1429-1450. Unnamed palladium telluride ,

M. E McCallum, R R. Loucks, R. R. Carlson, E. F. Cooley and The unnamed Pd"(Bi,SbLTenmineral containstiny inclusionsof peach-buff-colored T. A Doerge (1976) Platinum metals associatedwirh hydro- a slightly darker, mineral with a composition reported to conform thermal copper ores of the New Rambler mine, Medicine Bow exactly to PddTe,Bi,Sb), stoichiometry Mountains, Wyoming. Econ. Geol., 71, 1429-1450. Discussion An unnamedcream-colored, weakly anisotropic mineral of com- No X-ray or analyticaldata are given. L.J.C. positron PdTe, occurs as discrete grains intergrown with bismuthian merenskyite. Unnamed Pd(Te,Sb,Bi) Discussion Louis J. Cabri and J. H Gilles Laflamme (1976)The mineralogy Insufficientdata on the unnamed mineral and the bismuthian of the platinum-group elementsfrom some copper-nickel depos- merenskyite.L.J.C. its of the Sudbury area,Ontario. Econ Geol., 71, l159-1195 598 NEW MINERAL NAMES

E. F Stumpfl and M. Tarkian (1976) Platinum genesis:New 102.3 correspondingto (PGE + Cu, Ni, Fe)or".AsonrrSo,r,and mineralogicafevidence. Econ. Geol , 7l, 145l-1460. (PGE + Cu,Ni,Fe)o6nAso 27aSe 2e2. Grains are too small for X-ray diffraction but are considered to represent varieties of a mineral Three grains found as small inclusions in samples from the old with ideal RuAsS composition for the end member. Vermilion and the Creighton mine, Sudbury,Ontario. The mineral is pinkish cream in reflected light (air). No reflection pleochroism, Discussion but weakly anisotropic. ReflectanceR'g and R'p = 53.1,52.7 (470 This is probably a new sulfarsenideof the platinum group with nm), 58.1, 57.O (546 nm), 6l .3, 60.4(589 nm), 64.8,64.7 (650 nm). RuAsS as end member.X-rav data are required.L.J.C. Electron-probeanalyses ofthese grains gave: Pd 40.3,42.3,37 4;Bi 32.3,17.8,45.9:Te ll I, 188, 10.4;Sb16.2,22.0,6. l;totals99.9, 100.9,99.8 percent correspondingto Pd1o(Bio 4rSbo 36Teo rr)):0.', New Data Pd, and Pd, o(SbonuTeo rrBio ,,)):, o, oo(BiourTeo ,rSbo ,n)>:0 r". Brongniardite, ramdohrite A small (-17 x 30pm) inclusion was found in a samplefrom Bissersk, Urals, associatedwith hollingworthite, chalcopyrite, O. L Sveshnikova(1975) Chemical composition and classifica- pyrrhotite, and micheneritein a sperrylitegrain. The mineral is tion of sulfoantimonites of lead and sllver Trudy Mineral Muz., white, estimated to have 60 percent reflectanceand strongly an- Akad. Nauk SSSR, 24, l0'7-ll9 (in Russian). isotropic Probe analysisgave: Pd 3'1.6, Te 19.0,Bi 39.0, Sb 3.8, New microprobe analysesare given of "brongniardite," ram- total 99 4 percentcorresponding to Pdr o(Biou3Teo n2Sbo or);:t on(re- dohrite, andorite, and fizelyite,mostly on samplesfrom various calculatedby L.J C ) museum collections.Analysis of material from the Ust-Teremkov gave Pb 25.2,Ag 26.8, Sb 3l 8, S 18.0,sum Discussion deposit.Transbaikal, 101.8percent, corresponding to AgrPbSb,,Sn., near to the formula These four analysesplot within the PdSb (sudburyite, hex- of the discreditedmineral brongniardite,which is thereforeconsid- (polarite, agonal)-PdTe (kotulskite, hexagonal)-PdBi orthor- ered to be reestablished. hombic) composition triangle. Synthesisexperiments reported by Material labelledramdohrite from the type locality, Potosi,Bo- Cabri and Laflammeindicate a wide solid-solutionfield (hexagonal livia, was found to be a mixture of two phases,one with the NiAs-type) and a restrictedfield of orthorhombic symmetry.Any compositionof andorite, the other containing Ag 9.6, Pb 35 7, Sb proposednomenclature for mineralswith compositionsin the hex- 36.I, S 19.4,sum 1008 percent,corresponding to Ag Pb',Sba356 s, agonal solid-solutionfield, other than at the PdSb and PdTe cor- or AgPbrSbrSr.It is suggestedthat the name ramdohrite be trans- ners, will have to take account of the phase relations in the ferredto this compound. PdSb-PdBi-PdTe system.L.J.C. Discussion

Unnamed rhodium sulfide In the absenceof X-ray data, the proposalsare not acceptable, especiallyfor the "brongniardite," for which material from the Clive E. Feather (1976) Mineralogy of platinum-group minerals type locality was not examined.M.F' in the Witwatersrand,South Africa Econ.Geol.,71,1399-1428.

Small (<20irm) inclusionsoccur in platinum-group elemental- loy grains,especially in isoferroplatinum.Electron probe analyses Ceruleite gave:Rh 65.7,54.9,'71.7, 33.7, 53.2, 35.2; Pt 3.0, 13.3,2.5, 100, K Schmetzer,W Berdesinski,H Bank and E. Krovzek (1976) | | 2, 193:Ru 8.5,4 5,3.8, 27.0, 5.6, 3.2; Ir <0.l, <0.l, <0.l, <0.1, New studies of ceruleite Neues Jahrb. Mineral Monatsh, <0.1,ll l; Os(O l, <0 l, <0 l, <0.1,<0.1, 3.3; Ni 4.7,0.5,02, 418-425(in German). 02,O4,0l; Fe (0.1, 18, <0.1,l.l,3.1, 1.8;S 19.3,18.7, 18.5, 27.5,19.5,22.0; As -,2.9; totals1O1.2,937,967,99.5, Ceruleite (coeruleite) was described by Dufet (1900) (Dana's 93 0, 98.9 percent. These correspond to approximately System, Tth Ed., vol 2, p 927). The present study was made on (Rh,Pt,Ru,Os,lr,Pt,Ni,Fe)(S,As) or RhS. samples from southern Bolivia (exact locality unknown); their identity with type material (British Museum of Natural History) Discussion was proved by X-ray study. Chemical analysisof 7 samplesgave (range and average)CuO This is apparentlya new mineral. Poor totals and henceuncer- 1O.74-12.31,11.79; Al,O. 26.12-2752,26.85; FezOg 0.11 in l, not tain stoichiometryare probably due to small size.X-ray data are determinedin others; AsrO' 36.61-40.63,38.01; P,Ou traces; HzO requiredto confirm whether this is equivalentto syntheticRh"S" 22.18-2375,23.24; sum 99 5l-100.35 percent,the averagecorre- whichis cubic,a : 9.9103(23)A,probably Pm3m,lS. Geller (1962) spondingto the ratioCuO:AlrOg:AsrOr:HzO = l'79:3.18:2:156 Acta Crystallogr.,l5,'713-721 and ll98-l20ll. RhS is not known The formula proposed is CurAl'(OH)'.(AsOn)n.ll 5H,O X-ray in the Rh-S system.L.J.C. patterns of heatedceruleite show no changeup to 230', at 250o (14 770loss in weight) a new phaseis formed, as also shown by the Unnamed ruthenium sulfarsenide infrared spectrum Ar 290' the material turns green and becomes amorphous The DTA curve shows a sharp endothermiceffect at Clive E Feather (1976) Mineralogy of platinum-group minerals 365'. The mineral is insolublein water, but solublein HCl, HNOg, in the Witwatersrand,South Africa Econ Geol.,7l, 1399-1428. or KOH Electron probe analysesof hollingworthite from Witwatersrand X-ray powder data are given; the strongestlines (40 given) are gold mines revealedtwo grains with Ru ) Rh Analysesare: Pt 7 2e6(75Xo20),s.926 (70)(t l l ), 5 650( l00xl l 1),4.877 (50X21 l ), 10.3,2.8;1r7.5,0.4: Rh 15.1,20.3;Ru20.4,27 4; As38.l,29.6;Cu 4760(70)(121), 3 54s (60)(321),3.235 (s0x4ll), 2.9S4 (50X312), < 0.1, <0.1; Ni < 0.1, 6.4; Fe 0.8, I 7; S 7.8, 137; totals 100.0, 2.650(60X402). These are indexedon a triclinic unit cell, a 14.359 NEI4/ MINERAL NAMES 599

+ 0 003,b 14.68'7+ 0.003,c'7.440 +0.001A a 9606 + 0.03.lt 93.19 laverrite formula, (Na,Ca,Mn)uZrr(SirO,)r(O,F,OH)0.However, +0 040,t 91 63 + 0.04", V = 1556.943,Z : 2,G calc2.734,meas their proposed formula is not electrostatically balanced, and their 2.',70+ 002. detailed empirical formula departs even further from electrostatic The mineral consistsof deep blue concretionsup to 10 cm in neutrality. diameter, seenunder the electron microscope to consist of rod-like The x-ray powder diffraction data have been re-done,giving a crystalsup to 5 micronslong and 2 micronsthick. H 5-6, meann - pattern with the following strongestlines: 2 960 (10X402),2.881 1.60. Associated minerals include quartz, barite, goethite, and (7X710), 1.791(7X832), | 680 (7)(224,060), 2.242 (6)(622), and mansfieldite M.F. I 820 (6X840), which are substantially different from those reported in the earlierpublication. The pattern has beenindexed on an orthorhombic unit cell with a = 20.97,b = 10.10,and c : Chudobaite 7.214. An lR spectrum shows an absenceof the splitting of the R Dorner and K. Weber (1976) The crystal structureof chudo- main bands exhibited by laveniteand titano-lavenite. baite, ( M g,Zn ),HlAsO.). l0 H rO N atu rwiss ens chaft e n, 63, 243. Discussion Chudobaite is triclinic, space group Pi, a 7.797,b 11.440,c For someinexplicable reason, Portnov and Simonov do not give 6.616A,a ll5.3lo,P95.17",t93.87",2: l,G meas2.94,calc the group 2.90.Analysis (not given) by Ch Zaminer by electronmicroprobe space of their orthorhombic cell. Also, they do not gave the formula above. indicate how they overcamethe problem (if, indeed,they did) of the polysynthetictwinning. They stressthatthed valuescalculated Discussion from their orthorhombic cell give better agreementwith the mea- sured values than do the d valuescalculated from the monoclinic Highly unsatisfactory.Nothing is said of the original analysis lavenrtecell. However, equally good agreementis obtained if one with NarO 5.0, KrO 2.0, CaO I 0 percent,and why Na and K are employs a monoclinic unit-cell transformed directly from their not in the formula. M.F. t/zll}ll, orthorhombic parametersaccording to a: b = [010],c: [001],giving a - ll 09,b = 10.10,c ='7.21A,0 = 108.97'.The IR Julgoldite spectrum, itself, is not conclusive in distinguishingbetween an orthorhombic and monoclinic unit cell, sincethe absorptionpeaks A. Livingstone (1976) Julgoldite, new data and occurrences;a are a function of site symmetry rather than unit-cell symmetry. In secondrecording. Mineral. Mag., 40,761-763. conclusion,this reviewerfeels that the evidencefavoring the exis- Material from two localitiesin Scotland.hitherto labelled ae- tence of an orthorhombic polymorph of lavenite has not been nigmatite and goethite, is now identified as julgoldite. A micro- appreciablystrengthened by this latest report. E.H.N, probe analysis is reported for material from Auchinstarry pre- viously consideredto be goethite.The calculateddensity for this is ReJerences 3.56g/cm3, whereas the determineddensity for the otherjulgoldite Nickel, E. H. (1966) Orthorhombic lavenite.Am Minersl , 51, from a quarry Ratho near Edinburgh is 3.58. l5 addirional lines l 549-l 550. are now recorded in the powder pattern ofjulgoldite in the interval -, J F Rowland and J. A Maxwell (1958)The composition 9.71 Io 1.269A, all strong lines being in excellentagreement with and crystallographyof niocalite.Can. Mineral ,6,264-272 thosepreviously recordedIAm. Mineral., 56,2157 (1971)] A.P. Portnov, A. M., V. l. Simonov and G. P. Sinyugina( 1966)Orthor- hombic lavenite,a new variety of lavenite. Dokl. Akad. Nauk s.s.sR., 166, l199-1202. Orthorhombic lavenite

A. M. Portnov and G. A. Sidorenko (1975) New data on orthorhombic lavenite. Trudy Mineral. Muz., Akad Naak S.l.S.R, Woodwardite 24.203-206 E. H. Nickel (1976) New data on woodwardite Mineral. Mag., The name "orthorhombic lavenite"was first introducedby Port- 40. 644-647. nov et al. (1966).At the time, this reviewer(Nickel, 1966)regarded Sampleslabelled woodwardite from Cornwall and Carnarvon- the data as not being sufficiently conclusive to warrant the in- shire both appear to be hydrated sulfatesof Cu and Al but with troduction of a new mineral name, and this opinion was sub- differing Cu:Al ratios, X-ray powder patterns, and behavior on sequentlysupported by a vote of the I.M.A. Commission on New heating Since the type locality is in Cornwall, only the Cornish Minerals and Mineral Names, which rejected the proposal. material can be regardedas true woodwardite. Unfortunately X- Nickel's chief objectionthen was that the evidencefor orthorhom- ray powder data for the Carnarvonshiremineral have found their bic symmetryof the mineral,as opposedto tle monoclinicsymme- way into the JCPDS file under the number l7-132 as representing try of lavenite,was not establishedbeyond doubt. The mineralwas woodwardite. These data should be replaced by newly reported reported to be polysynthetically twinned, and such a twinned crys- powder diffraction data for woodwardite from Cornwall (no. BM tal, if monoclinic, could give an apparentlyorthorhombic "single- 40035);9.1 vs,4.43 w (very broad, diffuse),2.58 m, 1.50m. A.P. crystal" X-ray diffraction pattern, as had been reported for niocalite (Nickel et al., 1958),a mineral belonging to the same group as lavenite. Glockerite In their new submission,Portnov and Sidorenkoprovide little new data Using the chemical analysis reported by Port- B. Fojt (1975) On the problem of glockerite as a secondarymin- nov et al (1966), they propose the generalized formula eral of ore deposits. Scripta Fac. Sci. Nat., Uniu. Purkynianae NarCarZrr(SirO?)r(F,OH)nfor their mineral,as contrastedwith the Brunesis, Geol., 5, 5-20. 600 NEW MINERAL NAMES

Many sampleswere studied of dripstonesfrom Zlata Hory (for- are partly anisotropic.G 2.47-2.51Infrared data aregiven. X-ray merlyZuckmantel), Czechoslovakia, the type locality (Dana's Sys- study showedno measurablelines. Aftet being heatedat 250o, tem, 7th Ed., vol. 2, p. 587-588).Five completeanalyses are given; samplesgave lines at 63,3.28,2.467A,,indicating lepidocrocite. they show Fe,O" 61.2-66.7,SOs 8.15-11.45, H,O- 8.43-12.79, Samplesheated at 350o gave the pattern of maghemite,those HrO+ 12.42-16.96percent. DTA curvesshow a smallendothermic heatedabove 500' the patternof hematite. peak at 260-280"(loss of HrO), a sharpexothermic maximum at 550"(recrystallization), and a largeendothermic peak at 700"(loss Glockeriteis therefore,a cryptocrystallinevariety of lepidocro- of SO'). Somesaniples are isotropic with z (Na) 1.730-1.736;some cite with SOsand HrO. M.F.