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Home , Arseniosiderite, Braggite, Franklinphilite, Nelenite

American Mineralogist, Volume 78, pages 672-678, 1993

NEW NAMES*

JorrN L. J.qlvlnon CANMET, 555 Booth Street, Ottawa, Ontario KIA 0G1, Canada Enxsr A. J. Bunxn Instituut voor Aardwetenschappen,Vrije Universiteite, De Boelelaan 1085, l08l HV, Amsterdam, The Netherlands Eowano S. Gnrw Department of Geological Sciences,University of Maine, Orono, Maine 04469, U.S.A. hcpr Puzrnwtcz Institute of Geological Sciences,University of Wroclaw, Cybulskiego 30, 50-205 Wroclaw, Poland

Arsenoflorencite-(La), arsenoflorencite-(Nd ) The mineral abstractedpreviously as unnamedmono- B. Scharm,M. Scharmov6,P. Sulovskj',P. K{ihn (1991) clinic tobermorite (Am. Mineral., 77, p. 451, 1992) has Philipsbornite, arsenoflorencite-(La),and arsenoflor- beenapproved as the mineral clinotobermorite.The ideal encite-(Nd) from the uranium district in northern Bo- formulais CarSiu(O,OH),s.5HrO,and D-."" : 2.58,D,^,, hemia, Czechoslovakia.Casopis pro Mineral. Geol., : 2.69 g,/cm3.Type material is in the National Science 36(2-3\,103-113. Museum, Tokyo, Japan.The new name is an allusion to the mineral being the monoclinic polymorph of tober- Electronmicroprobe analyses gave LarO, 12.99,4.63, morite. J.L.J. Ce,O, 1.32,3.12, Pr,O, 0.58, 1.65,Nd,O3 0.95, 8.65, Sm,O,-, 1.30,SrO 7.27,-, CaO 1.01,0.45, BaO -, 4.87, PbO-,2.51, Al,O3 26.42,23.29, FerO,0.80,3.76, AsrO, 31.05,34.19, P20s 2.84, 1.94, SOr 5.03, 0.60, H,O (calc. Franklinphilite* for 6OH) 9.74,9.04, sums 100 wt0/0,corresponding to P.J. Dunn, D.R. Peacor,Shu-Chun Su (1992) Franklin- (LaooorCeo oooPro oroNdo o' Sfo,rnCao ,oo)", oru(Al, ,rr- philite, the manganeseanalog of , from Feooru)",n.,[(AsO4)r oee(PO4)o rrr(SOo)o ror]"roun(OH), and to Franklin, New Jersey.Mineral. Record,23, 465-468. (Ndo ,orl,ao,roCeo ,,oPro ouoSmo oorBao ,noPbo ourCao oor)", ooo- Electronmicroprobe analysis gave SiO, 44.0,Alroj 3.6, (Al,,r,Feo,rr)", 0,.[(AsOo),,rr(POo)o,uo(SOo)oooo]r,,rr(OH)u, FerO. 7.8,MgO 6.4,KrO 1.5,NarO 0.4,ZnO 5.9,MnO ideally IaAlr(AsOn)r(OH)uand NdAlr(AsO")r(OH)u,which 22.3,HrO (by difference)8.1, sum 100wto/o, correspond- are the La-dominant and Nd-dominant members of arse- ing to (K, uoNa,or)rr r, (MnruorMg,r rrZn, orFe)\r)ro, (Siuo rr- noflorencite.The first occursas the coresofzoned crystals Al, ,uFel.jr)"r,[O,63 2r(OH)r2 ,rf"r,u.nHrO, ideally KnMnor- with florencite-(Ce); also as 30-pm irregular aggregates (Si,AD,r(O,OH)r,u.nHrOwhere n = 6. The mineral is the with arsenogoyazite,showing mutual compositional gra- isostructural Mn analogue of stilpnomelane. Occurs as dations; as the outer zones of microspherical grains, 5- radial aggregatesof dark brown platy crystals;light brown l0 pm in diameter, containing crandallite cores; and as , vitreous to slightly resinous luster, 11 : 4, imper- complex, nearly isometric grains that also contain cran- fect {001} ,brittle, nonfluorescent,D*""" : 2.6- dallite and arsenoflorencite-(Nd).The occur in 2.8, D.^1": 2.66 g/cm3with Z : 3/e.Optically transparent drill cores from the Holidky, StreZ,and Osedn6uranifer- to translucent,biaxial negative, a: 1.545(5),P: 1.583(3), ous depositsof northern Bohemia,Czech Republic, mainly r : 1.583(3),2V^.^":l0(3)', 2V**: 0; X A (001): as a cement in the host Cretaceoussandstones. J.L.J. -6, X: pale yellow, Y : Z : deep brown. Electron diffraction patterns revealedan hk} net similar to that of stilpnomelane, which is triclinic but has a pseudoortho- Clinotobermorite* hexagonalcell; by analogywith this cell,a: 5.521(4),b : 9.560(6),c : 36.57 A. Strongestlines of the powder V. Henmi, I. Kusachi (1992) Clinotobermorite, pattern(l14.6-mm Gandolfi camera,FeKa radiation)are CarSiu(O,OH)18.5H2O,a new mineral from Fuka,Oka- yama Prefecture,Japan. Mineral. Mag., 56, 353-358. I 2.3( I 00,003), 2.737 (30,202), 2.583(40,205), 2.362(30, 208), 1.594(30,060),and 1.580(30,063). The mineral occurswith friedelite in a centimeter-wide vein that crosscutsa brecciaofaegirine, , chamosite, 7- phyllosilicates * Before publication, minerals marked with an asterisk were and interlayered and l4-A in a specimen approved by the Commission on New Minerals and Mineral from the Buckwheat mine dump at Franklin, Sussex Names, International Mineralogical Association. County, New Jersey;also with nelenite,, and 0003-004x/93l0506-0672$02.00 672 JAMBOR ET AL.: NEW MINERAL NAMES 673 tirodite in another assemblage.The name is a combina- versity Mineralogical Museum at Wiirzburg, Germany, tion for the type locality (Franklin) and the Greek word and Kiel, Germany.J.L.J. for friend (philos). Type material is in the Harvard Min- (Ir,Pt,Rh)S, (Pt,Ir)'(As,S). eralogicalMuseum. J.L.J. Unnamed and I.Ya. Nekrasov, V.V. Ivanov, A.M. Lennikov, R.A. Krasnogorite, krasnoselskite Oktiabrskij, V.I. Sapin,V.I. Taskaev,B.L. Zalishchak, (1991) mineral- B.V. Chesnokov,L.F. Bazhenova,E.P. Shcherbakova, T.A. V.V. Khitrov New data on zoned mas- Michal, T.N. Deriabina (1988)New mineralsfrom the izationof alkaline-ultrabasicconcentrically 320(3), burned dumps of the Chelyabinskcoal basin. In Min- sifsof the Far East.Doklady Akad. Nauk SSSR, (in eralogy,technogenesis, and mineral-resourcecomplexes 705-109 Russian). of the Urals. Akad. Nauk SSSR-UralskoeOtdel.. 5-31 Microprobe analysisof a rim of 3-10 pm on ,in (in Russian). chromite-bearing dunite of the Chadskij massif (eastern Krasnogorite WO, and krasnoselskite CoWOo were marginof theAldan Shield,Siberia, Russia) gave Pt 13.08, identified by X-ray study. They occur as pseudomorphs Pd 0.34.Rh 4.94.lr 46.47, Os 2.62,Fe 2.93,Cu 1.08,S after hard alloy VK8 (92o/oWC,80/o Co) on the platesof 27.00,As 0.15,sum 98.62(98.61) wto/0, corresponding to the cutting element of a drilling machine found in burned (IrouoPto ,rRho ,rOso *)- ,oS,or. Microhardness 6l 5 kglmm'z. rocks of the Krasnoselskayamine in Krasnogorsk, Che- Microprobe analysisof 25-pm subhedralplaty inter- lyabinsk coal basin, southern Urals, Russia.The pseu- growths in isoferroplatinumoccurring in dunites of the domorphs are greenishor bluish gray, luster dull, bluish Konderskij massif (easternmargin of the Aldan Shield, graystreak, conchoidal or splinteryfracttre, H : -4, D^,^" Siberia,Russia)gave Pt 51.62,Rh 1.08,Ir 10.57,Os0.28, : 6.62 g/cm3.Brittle, but can be polished. Cu 0.16, S 2.20,As 33.14, sum 99.05wt0/0, corresponding Krasnogoriteis orthorhombic,a: 7.39(l), b: 7.53(l), to (Ptr 57Ir033Rho ou)r, ,u (As, u.Sooo)r. or. Microhardness 500 c : 3.84(l) A. Strongestlines of the X-ray powderpattern kg,imm'?. are 3.848(100,001),3.7 69(100,020), 3.656(86,200), and Discussion.IrS, is known as orthorhombicand ascubic 2.625(32,220). syntheticphases. Ptr(As,S). has also beenreported from Krasnoselskiteis monoclinic, a:4.95(l), b: 5.68(l), placersnear Vladivostok, Russia (Am. Mineral., 78, p. c : 4.70(l) A, 0 = 90.0". Strongestlines of the X-ray 233. 1993).J.P. powder pattern are 3.739(41,1l0), 3.61l(23,01 l), Unnarned Pd PGM 2.916(77,II l), and r.695(20,122). Discussion.Neither name has been submitted to the T.L. Grokhovskaya,V.V. Distler,S.F. Klyunin, A.A.Za- CNMMN for approval.J.P. kharov,I.P. Laputina(1992) Low-sulfide mineralizationof the Lukkulaisvaarapluton, northern Karelia.Geologiya Rudnykh Mestorozhdeniy,1992, no. Liebauite* 2, 32-50 (Englishtranslation in Internat.Geol. Review, M.H. Zoller,E. Tillmanns(1992) Liebauite, Ca,Cu,SinOru: 34(5),503-520). A new with 14er single chain. Zeits. Kotulskite, merenskyite,michenerite, moncheite, te- Kristallogr., 200, | | 5-126. largpalite,sopcheite, majakite, mertieite II, isomertieite, Electron microprobe analysis gave CaO 15.0, CuO stillwaterite,sperrylite, braggite, , tulameenite, 34.9, SiO, 48.5, sum 98.4 wt0/0,correspondingto Carnn- hollingworthite, irarsite, arsenopalladinite,and the fol- Cuo'SirorOr.. Occursas bluish greentransparent crystals lowing unnamed platinum-groupminerals (PGM) occur <0.03 mm, vitreous luster,11 : 5-6, D"^r": 3.62 g/cm3 in the Precambrian Lukkulaisvaara layered ultramafic witla Z : 4. Optically biaxial positive,a : 1.722O),A : pluton on the Russianside of the Russian-Finnishborder. 1.123(l), 7 : 1.73aQ), 2V : 72.8'. Single-crystalX-ray structure study (R : 0.046) gave monoclinic symmetry, Pd,(Sn,Sb) spacegroup C2/c, a: 10.160(l),, : 10.001(l),c : Two analysesgave Pt 0.16, 0.5, Pd 63.56,63.01, As 19.973(2)4,0:91.56(2). Strongestlines of the powder 0.08,0.01,Ag 0.93,0.68,Sb 16.55,17.45"Sn 16.43,15.07, pattern(57. 3-mm Debye-Scherrer)are 7.1 3(60, 1 l 0), 6.70- Te0.60,0. 19, Bi 0.25,0.70,sum 98.56,97 .26wt0l0. Occurs (70,I I 1,1 I l), 3.l2(90, I 3I, I 3l), 3.00(100,3I 2,t32,132, as cream-colored,weakly anisotropicgrains of <20 p'm 116), 2.45(60,226),and 2.41(70,226);the line at 3.00 with mertieite II, merenskyite,sopcheite, and hessitein overlaps with that of associatedcuprorivaite, but 1"","for rock-forming silicatesand in chalcopyrite-bearingsulfide I l6 is 91. schlierenin microgabbro-norite. The mineral was initially found with tenorite, volborth- ite, calciovolborthite, and cuprorivaite in cavities in a Pd8sb3 0.5-m mudstonexenolith from the Sattelbergscoria cone Occursas grainsup to 30 pm in size,localized in chal- near Kruft, Eifel district, Germany, and has since been copyrite in which there is intergrowth with sopcheiteand found in xenolithsat two additionalcones. The new name micheneriteor with hessiteand merenskyite.Creamy rose is for Friedrich Liebau of Kiel, in recognition of his work color, weakly anisotropic. Analysis gave Pd 68.68, As on silicatecrystal chemistry. Type materialis in the Uni- 0.97, A90.86,Sb 26.37,Te0.55, Bi 0.23,sum 97 .66 wto/o. 674 JAMBOR ET AL.: NEW MINERAL NAMES

The virtual absenceof As distinguishesthis mineral from The chalcopyrite-molybdenitevein depositsofthe Ros- mertieite II. senore field, SrednaGora area,Bulgaria, contain aikinite, friedrichite, and hammarite, as determined by wave- PduAgTeo length-dispersionelectron microprobe analyses. Analyses Analysisgave Pd 52.12,Ag7 .89, Te 40.39,sum 100.37 by energy-dispersionmethods without standardsalso in- wt0/0.Bright gray in reflected light, distinct bireflectance dicatedthe presenceof lindstromite,rezbanyite (see Am. from white to bright gray, anisotropic with brownish po- Mineral.,77, p. 1308, 1992),and an unidentifiedsulfide, larizationcolors. Occurs as grains of30-50 pm associated for which two analysesgave Cu 22.53,22.10,Fe 10.05, with telargpaliteand tulameenitein a millerite-bornite- 9.74,Ag 45.74,46.53, S 21.69,21.61,sums 100 wt0/0, chalcopyrite paragenesis. calculatedas CuuFerAgrS,,.The grains are statedto be too small to obtain further data. J.L.J. (Pd,Pt,Ag)r(Te,Bi), Threeanalyses gave Pt I .0,0.62, 0. I 2, Pd 65.01, 6 I .60, 61.22,493.15, 4.41, 1.0, Te 28.42,32.76, 15.84, Bi 1.63, 4CaO'3AlrOr.SO, -,25.34,Pb -, -, 0.12,Sb -, -, 0.10,sum 99.21, 99.39, H. Heritsch( I 990)A contactzone with rareminerals from 103.74wto/0. Occurs as creamywhite, weakly anisotropic the nepheline basanite quarry at Kl6ch (southeast grains 10-15 pm in size, in complex intergrowthswith Steiermark);natural occurrenceof 4CaO'3Alror'SO3. kotulskite,moncheite, telargpalite, and tulameenite. Mitt. Abt. Mineral. LandesmuseumJoanneum, 58, l5- 35 (in German, Englishabstract). (Pd,Cu,Pt,Fe)nSn(Te,S)" A contactzone formed at temperaturesaround 1000'C Threeanalyses gave Pt 0.89,3.08, 3.92,Pd 43.59,44.05, on a calcite-dolomitexenolith in nephelinebasanite at -, -, 41.83,Ir 0.09, Cu 16.91,12.81, l6.l2,Fe 2.'7 4,3.55, Kloch, southeasternSteiermark, Austria, contains meli- -,0.94,0.06, 1.91,Ag Sn9.67,9.54,3.48, S 4.88, 5.04, lite, kalsilite,wollastonite, perovskite, mayenite, brown- 4.56,Te 22.70,21.51, 21.49, sum 101.47,100.52, 99.37 millerite, periclase,corundum, larnite, and a calciumalu- wt0/0.Occurs as rodlike and lathlike grains with pro- minate that is in SiOr-rich glassand is intergrown with nounced bireflectance and anisotropy. Intergrown with brownmillerite, mayenite,periclase, and .The grain kotulskite,moncheite, and telargpalitein chalcopyrite. sizeof the intergrowthsis l0-30 prm.A normalizedelec- tron microprobeanalysis gave AlrO, 50.l, CaO 36.7,SOj (Pd,Ag,Cu).S. 13.1,sum 99.9 wto/o;a small but constantSiO, contentis -, Two analysesgave Pr 0.33, Pd 45.91, 45.58, Cu also present (no quantitative data offered). The mineral 28.83,22.73,Fe 0.05, 0.28, Ag 10.04,9.57,S 20.25,19.92, is cubic; strongestX-ray diffraction (XRD) lines (Co ra- sum 100.41,97.98 wto/o.Gray in reflectedlight, without diation) in a mixture with brownmillerite and mayenite perceptibleanisotropism or bireflectance.Reflectance per- are 4.92(l 7,32r), 3.75 (60,422), 3.24(l 3,4 40), 2.653 - centagesin 20-nm stepsfrom 420 to 740 nm are 46.3, (l 0,444), 2.46 4(20,6 42), and 2.I 68(r0,822), from which 47.4, 40.4,49.0,49.4, 49.7, 50.2, 50.7, 5r.2, 5r.6, 52.t, a : 18.39 A. The mineralis suggestedto bethe first natural 52.6,53.2,53.8,54.4,55.0,and 55.6. Occurs as grains of occurrenceof 4CaO'3AlrOr'SOr,a phasecommonly found 15-20 pm in polymetallic intergrowthsof PGM among in Portland cementclinker. rock-forming silicates. Discussion.The naturaloccurrence of the phase4CaO' Discussion.Pd, (Sn,Sb)was reported without data from 3Alror.SO3 (or CaoAluO,rSOo)in a similar paragenesis the Noril'sk Intrusion(Am. Mineral.,74,p. 1218,1989); hasbeen described as the mineralye'elimite (absrr. rn Am. could be paolovite,PdrSn. The analysisfor PdrSb,is not Mineral.,7 2, 226-227, I 987).E.A.J.B. reallydistinct from previousanalyses for mertieiteII (e.g., 1.8 wto/oAs reported in Am. Mineral., 61, 1249-1254, 1976), and mertieite II has been synthesizedin the pure Zn analogaeof ktenasite Pd-Sbbinary (Can. Mineral.,29,401-409, l99l). Pd,Te, A. Livingstone(199 1) The zinc analogueofktenasite from has beenreported from the Stillwater Complex(Am. Min- Smallcleughand BrownleyHill mines,Nenthead, Cum- p. eral.,69, 410, 1984);another analysis of this mineral, bria.J. RusselSoc., 4(l), l3-15. also from the Lukkulaisvaara intrusion, was abstractedin Am. Mineral., 76, p. 1438(1991). Also in the l99l ab- The averageof six electronmicroprobe analyses ofgrains stract are data for Pd, (Cu,Ag)rS., which here is described from the Smallcleugh mine and six from the Brownley as (Pd,Ag,Cu)oS,.J.L.J. Hill minegave, respectively,ZrO 62.88, 33.38, CuO 3.36, 21.73,SOr 17.68,22.31 wto/o;CHN analysisof a l-mg samplegave20.5 wto/o HrO. Afterrecalculationusing stoi- chiometric SO. and HrO valuesthe respectiveresults are CuoFe.AgrS,, ZnO 52.96,33.57, CuO 2.84,22.02, SO. 21.97,22.08, T.A. Todorov ( I 990)Copper-lead-bismuth sulphosalts of HrO 22.23, 22.33 wto/o,corresponding Io (Znno"- the aikinite-bismuthiniteseries in the Rossenore field Cuorr)",0 00 (SO")n(OH)r, . l2HrO and (ZnuoCuoo)",00- deposits.Doklady Bolg. Akad. Nauk, 43(l), 87-90. (SOo)"(OH),, . l2HrO. Structurally,the first analysiscor- JAMBOR ET AL.: NEW MINERALNAMES 675 respondsto Zn,(Zn)o(Zn, orCuor,)"o, clearly indicatingZn which leads to the formula (K,NaXMn,Fe,Mg,Ca, dominance in the two Cu sites for ktenasite.The mineral Ba),[SioO,o](OH)'nHrO.The infrared spectrumhas two occursas blue-greenand bright blue, irregular grains,gen- well-resolvedbands in the interval 400-l100 cm-r, one erally platy and 0.2-0.3 mm across.Soft, nonfluorescent, band near 1600 cm-', and a broadenedband in the in- no cleavage.Optically biaxial negative,a : 1.588,0 : terval 3300-3800 cm-', the last two bandscorresponding 1.604,7 : 1.619(blue-green variety). X-ray powder data to vibration modesofweakly bondedor zeoliticHrO. The are similar to those of ktenasite; refinement (blue-green mineral is almost amorphous to X-rays, yielding only var.)gave a: 5.652,b : 6.101,c : 23.645A, P : 95.6. three very broad, weak lines at 4.4,2.59, and 1.59 A. The mineral was collectedunderground at the Smallcleugh Under the electron microscope,larger particles (l-3 pm) and Brownley Hill mines in the parish of Ashton, Cum- yieldedno patterns,but isometricflakes 0. I -0.5 pm across bria, England.The Zn-dominant analogueof ktenasitehas yielded patterns with a hexagonal or nearly hexagonal been reported previously (Am. Mineral., 64, 446-448, motif similar to thoseof layeredsilicates; d valuesof the 1979)but has not beennamed. J.L.J. reflections correspondedto those for the powder diffrac- tion lines. Insolublein HCl, but losesits color and gelat- inizes.The mineral is reddish brown; in thin slices,brown- Mn analogueof arseniosiderite ish yellow, translucent. Streak light brown, greasyluster, parting absent, J . Lorenz ( I 99 1) The minerals of the rhyolite quarry at conchoidal fracture, H = 3, cleavageand : Sailauf-An addition. Aufschlull,42,l-38 (in German, D.",. : 2.206 g/cm3. Optically isotropic, n l -465.The English abstract). mineral was found in three samplesof charoite rock from the SirenevyyKamen'deposit in Russia,occurring as flat- A rhyolite in a quarry north of the village of Ober- tened aggregatesin rock composedprincipally ofcharoite, Sailauf (close to Aschaffenburg, northwestern Bavaria, potassiumfeldspar, aegirine, and tinaksite.The mineral Germany) contains severalveins of Mn with a number is inferred to be a poorly crystallized,hydrated micaceous of rare arsenateminerals, e.g., brandtite and an unnamed silicate rather than neotocite and related minerals, differ- calcium manganesearsenate for which electron micro- ing from the latter in its substantialcontent of K and Na, probe analyses(no quantitative data offered) show only absenceof Al, and higher Si/Mn ratio. Ca, Mn, and As; Fe wasnot detected.The strongestXRD Discussion.Assuming an anion compositioncharacter- lines(Cu radiation, l7 linesgiven, but no indices)are 8.75 istic of micasand assumingthat Ca and Ba substitutefor (1: 95), 5.64(30), 2. 9 3( l 00),2.89 (42), 2.8 | (26),2.7 6(42), K, the following formula was calculatedfrom the average 2.63(26),2.515(26), and 2.198 A (62). On the basis of analysisand HrO estimatedby difference:(KorrNaoor- chemicaland X-ray data the mineral is thought to be the Cao ,'(Mn, ,oFeo,,Mgo ,r)", e8sio 2rO''(OH)2'2.86- monoclinic (?)Mn analogueof arseniosiderite,a member ouBaoor)r, HrO. There is an excessof alkalis and Si, which does not of the mitridatite group. The mineral forms small (0.5 appear in the reported formula becausethe authors nor- mm) tabular six-sidedcrystals. Color black, dark brown malizedto 10.50: l0O + lOH insteadof l10: l0O to red-brown, streak light brown, high vitreous luster, + 2OH. The authors showed that the infrared spectrum perfect cleavage,thin cleavageflakes are red trans- {100} of the Mn silicate is similar to that for sturtite, another lucent,H : * 3.5,D-"". : 3.6 g/cm3,soluble in dilute HCl. Mn silicate whose spectrum is reported to resemble the The crystals resemble those of hematite in form, color, spectraof trioctahedral hydrous (seeAm. Mineral., and luster.The mineral occurson Mn-bearingcalcite with 65, p. 210, 1980)and of stilpnomelane.Possibly the Mn arseniosiderite(transitions between the two mineralshave silicate is a poorly crystallized, modulated layer silicate. been observed), hausmannite, kutnohorite, dolomite, E.S.G. quartz, and calcite. The existenceof the Mn analogueof arseniosideriteas a stable phase in nature has been postulated by Moore (Mineral. Record,4, 103-130, 1973).Further studiesare Na-Ba-Mn fluorosilicate being done at the Institute of Mineralogy and Crystal N.A. Yamnova, D.Yu. Pushcharovskii,T. Mernal V.V. Structure of Wiirzburg University. E.A.J.B. Kalinin, L.V. Kalacheva(1992) Crystal structureof a new natural Na, Ba, Mn-fluorosilicate.Soviet Phys. Crystallogr.,37 (2), 174- I7 8. Mn silicate The mineral occurs as grains and small concretions in K.A. Lazebnik, L.V. Nikishova (1992) The first occur- braunite of the Ir-Nimi Mn deposit of the former renceofa -bearingsilicate in charoiterocks. Soviet Far East. Single-crystalX-ray structure study (R : (in Doklady Akad. Nauk SSSR,322(3), 589-594 Rus- 0.065)gave orthorhombic symmetry, Pnma, sian). a : 23.42(l),b : 12.266(S),c : 7. I 8 I (5)A. X-ray spectral An averageof six electron microprobe analysesof the analysisgaveSiOr 32.09, MnO 13.22,MnrO, 10.84,Na,O mineral gave SiO, 50.33,FeO 7.35, MnO 16.87,MgO 3.l2,BaO 36.73,H,O 2.40 wto/o(sum 98.40);the struc- 2.17,CaO 0.65, BaO 0.73,KrO 5.15,Na,O 2.93,sum turally determined formula is NaBa, (Mn2*,Mn3*)o- : 86.17 wto/o [sic]. HrO is inferredto be 13.83by difference, [SioO,0(OH)r] [Si,O,]OrF. H,O, with Z 4. Strongest lines 676 JAMBOR ET AL.: NEW MINERAL NAMES

of the X-ray powder pattern (diffractometer, FeKa radi- Fergusonite ation, nine lines listed) are 4.556(54 -6,121), 3.288(68. 5, Weiliang Gong ( I 99 I ) A study on high-temperaturephase 52l ), 3.0l 7(l 00,70I ), 2.984(98.5,222),2.64 | (94.6,34 r), transitionof metamict fergusonitegroup minerals.Acta and 2.630(73.8,602,820).The Raman specrrumhas its MineralogicaSinica, I l(l), l-8 (in Chinese,English ab- highestfrequency maxima aI 3599 and 3521 cm-r, cor- stract). respondingto HrO and OH groups.J.L.J. Weiliang Gong (1991) Chemistry and evolution of fer- gusonite-groupminerals, Bayan Obo, Inner Mongolia. ChineseJ. of Geochem., l0(3), 266-276 (in English; Nar.Kr[Si,rO36(OH)r8l.38HrO also Acta MineralogicaSinica, ll(3),200-208, in Chi- N.A. Yamnova, R.K. Rastsvetaeva,D.Yu. Pushcharov- nesewith English abstract). skii, T. Mernaf,M.G. Mikheeva,A.P. Komyakov(1992) Morphological study of metamict fergusonite crystals, of the new annular Na, K silicate mainly from Bayan Obo, Inner Mongolia, showedthem Na,uK,[Si,rO3u(OH),8].38H,O. Soviet Phys. Crystal- to be monoclinicand tetragonaldimorphs. Heating of the logr.,37(2),167-174. tetragonal phaseled to crystallization, gradually produc- The mineral occursas inclusions l-3 mm in size in- ing at 700-900'C a well-defined,sharp Debye-Scherrer tergrown with revdite among the interstices of fenaksite pattern. Below 730-880'C the heatedphase character- in fenaksite-delhayeliteveins at Mount Rasvumchorr, istically has a broad diffraction pattern and is designated Khibiny alkaline massif, Russia.Colorless, transparent, fergusonite-Z,for which the strongestlines of the X-ray vitreous luster, steplikefracture, perfect {100} cleavage, patternare 3.06 5( I 00,I | 2),2.7 57 (l 6,004), 2.6 | 0(20,200), opticallybiaxial negative, a: 1.460,P : 1.478,7: 1.48l, | .892(29,20 4), 1.844(t7,220), and I .5 8 2 A ( I 8,3 I 2),lead- 2V: 40, strongdispersion with r > v.Single-crystal X-ray ing ro a : 5.222,c : 11.07 2. A secondtetragonal phase, structurestudy (R : 0.048) gave monoclinic symmetry, designated7",, is stablebetween 730 and 880 "C and has spacegroup P2,/c, a:24.91(5),b: 11.94(I),c : 14.92(2) a sharpXRD patternwith strongestlines of 3.080(I 00, I I 2), A, B : 94.47(9),z:2. J.L.J. 2.62t(25,200), t.9t3(37,204), r.856(t9,220), and 1.590(30,312),from whicha : 5.246,c : ll.I72. The linesat 1.913and 1.590in the Z phasecorrespond to doubletsin the 7"phase: | .892(29) and l. 882( I 2); I .5 89( I 0) and 1.582(18).Annealing of a monoclinicmetamict par- New Data ent gives a monoclinic product, designatedfergusonite- M. The DTA pattern of the monoclinic form, however, shows an endothermic peak between 740 and 760 "C, Cuproaurite which may representa phasetransition to the tetragonal L.V. Razin,A.L. Razin(1991) A uniquenative cuproau- form. rite nuggetfrom the southernUrals in the exposition It is proposed that the fergusonite-groupminerals be "Diamond Treasuryof the USSR." IzvestiyaVysshikh named accordingto structuraltype, using the prefixesI UchebnykhZavedeniy, Geologiya i Razvedka,1991(5), or M (tetragonaland monoclinic,respectively). Thus, for 136-137(in Russian). example,fergusonite-(Y) would become Z-fergusonite-(Y) to designatethe tetragonalform, and fergusonite-beta-(Y) A chemicalanalysis (method unspecified)gave Au 73.53, would becomeM-fergusonite-(Y) to designatethe mono- Ag 5.55,Cu 20.11, rock 0.81,sum 100wto/0, which cor- clinic form. respondsto Auro'Cuo, ,oAEunr.The mineral forms a den- Discussion.No new nomenclaturesystem should be dritic aggregate10.5 cm long and weighing 199.9g, part introduced,as this has,prior to approvalby the CNMMN. of which consists of intergrown cubes and cuboctahedra Aside from prefixes,the new systemwould also require up to 8 mm across. The aggregateis silvery gray with a the discreditationof fergusonite-beta.J.L.J. straw yellow tint that is more pronouncedat one end of the aggregate.Compositionally, this mineral could be ei- ther cuproaurite or tetraauricupride; the cubic symmetry Fergusonite-(Nd) and dendritic habit suggestthe former. No other data were obtained.The specimenwas collected in the Kochkar mine, Weiliang Gong (1991) Chemistry and evolution of fer- gusonite-group Inner Mongolia. southern Urals, Russia, but the specific geological con- minerals,Bayan Obo, ChineseJ. Geochem.,l0(3),266-27 6 (in English). ditions ofthe occurrenceare not known. Discussion.In the absenceof X-ray data, it is not pos- Three complete chemical analysesare listed for a min- sible to identify this mineral. In 1975 L.V.R. described eral stated to be (tetragonal) fergusonite-(Nd). No other the phaseCurrAu.nPd, as "aurocuproite," which was re- data other than occurrenceare given. The mineral is from viewed(Am. Mineral.,62,p. 593, 1977)and considered riebeckite-rich,dolomite-type Nb-REE oresat BayanObo. to be an unnecessaryname for palladian AuCu or auroan Discussion.A partial analysis(REE only) for this min- palladian copper. Neither aurocuproite nor cuproaurite eral, also from Bayan Obo, was abstracted irt Am. Min- has beenapproved by the CNMMN. E.S.G. eral., 74, 946-947, 1989.J.L.J. JAMBOR ET AL.: NEW MINERAL NAMES 677

Koutekite phasethat was either a pigment known under the names patentyellow, patent S.D. Abulgazina,P.Ye. Kotel'nikov, S.A. Sal'kov, B.M. Turner's yellow,and Montpelieryel- Tasov,M.A. Yarenskaya,G.P. Yasnitskaya(1991) New low or a by-product of a process for preparing soda. data on koutekite. Zapiski Vses. Mineral. Obshch., Schnorrer-Kohler(1986) has reported a natural phase, 120(2),49-5 I (in Russian). from the famous Laurium Pb slags of Greece, that has X-ray powder data identical to those of synthetic Electronmicroprobe analyses gave Cu 66.25,67.33, As a-PbrOuCl,(PDF 6-0393). The mineral occursas com- 33.52,33.35,sums 99.77, 100.68 wto/0, which conespond positesmall (10pm) crystalsformingwartlike, lightyellow to Cur and Cur.rAs. In reflectedlight the mineral is rrAs aggregates< 100 pm, under hydrocerussite.The crystals violet gray and markedly bireflectant, strongly anisotropic are orthorhombic-pseudotetragonal. with a color effect in red-blue tones. X-ray powder data Synthesisof the hydratedphase Pb,O6Clr.2HzO by ti- (CoKa radiation, 57.3-mm camera)gave hexagonalpa- tration of aqueous PbCl, solutions with base at high pH rametersof a : 23.068(8),c : 14.540(7)A, that is, a led Edwardset al. (1992)to concludethat the compound doubled (relative to the type material), which is inter- Pb?O6Cl,does indeed occur naturally. Dehydration of preted to result from a superstructure.The strongestlines synthetic PbrO6Cl2-2H,O,however, forms the dimorph ( I 7 given)are 3. 5 68(20,0 I 4), 3.340(20,06 0), 2.580(30,262), B-Pb?O6Clr,not lorettoite.E.A.J.B. 2.089(80,282), 2.0 44(90,r I 7), and 2.00I ( I 00,I 27). Kou- tekite occurswith domeykite,16llingite, native silver,and nickeline in Cu-mineralizedsandstone that is part of a Carboniferous-Permian sequencein Kazakhstan. Inter- Meta-uranocircite II growths of koutekite with domeykite and lollingite range R.F. Vochten,L. Van Haverbeke,K. Van Springel(1992) from severalhundredths of a millimeter to 0.5 mm. As a Transformationof chernikoviteinto meta-uranocircite rule, koutekite replaced domeykite. II, Ba(UOr)r(PO4),.6H,Oand study of its solubility. Discussion.Koutekite from thetype localityin Bohemia Mineral.Mag., 56, 367-372. and from Francehas a formula closeto Cur rAs (Picotand prepared Vernet, Bull. Soc. fr. Min€ral. Cristallogr., 90, 82-89, Syntheticmeta-uranocircite II was by ion ex- 1967),which is slightlyricher in Cu than the Kazakhstan changewith chernikovite(H3O), (UO,), (POo)r.Meta-ura- material.The powder patternof the Kazakhstanmaterial nocircite II has the composition Ba(UO,),(PO)2.6H2O differs from those of the two others, mostly in the low- and reversiblydehydrates from meta-uranocircite(or meta- anglereflections (i.e., for d > 3.3 A). E.S.G. uranocirciteI), Ba(UOr),(PO4)r.8HrO. Strongest lines of the X-ray powder pattern for meta-uranocirciteII (Gui- nier-Hiigg, CuKa, radiation) are 3.207(85,024), - Leucophanite 2.927 2(90,1 32), 2.9006(90,3| 2), 2.606s(80, l l 6), 2.458 | (75,233), 2.20 1 5( 1 00, I 43,r43), and 2.1 869( 1 00,24 r,226, E. Cannillo, G. Giuseppetli,F. Mazzi, Y . T azzoli (1992') 241).D^"^": 3.964,D.,,: 3.970g,/cm3 with Z : 4. The crystal structure of a rare earth bearing leucopha- Discussion.This lower hydrateis known to occur nal- nite: (Ca,RE)CaNa,BerSio O,, (F,O)r.Zeits. I(ristallogr., 202,7 t-79. urally, but no completedescription has been given, and the nomenclatureused above does not haveofficial status Single-crystalX-ray structuralstudy (R : 0.013)of leu- (seeAm. Mineral., 68,p. 472, I 983).PDF data (cardsI 7- cophanite from Mont St. Hilaire, Quebec,showed that 759, 25-1468, 36-407) do not help to resolve the no- the orthorhombic symmetry is loweredto triclinic, space menclature,but it is evident that the hexahydrateexists : : groupPl, a 7.411,b 7.398,c : 9.986A, a : 90,A both with monoclinic and tetraeonalstructures. J.L.J. : 90, t: 90", by the presenceof about 3 wt0/oREErOr. The REE substitute for Ca (about one atom of REE per 16 Ca sites),and substitutionoccurs only in two of the four sitesequivalent in the orthorhombic cell. J.L.J. Moganite G. Miehe, H. Graetsch(1992) Crystal structureof mo- ganite:A new structuretype for silica.Eur. J. Mineral., Lorettoite 4, 693-106. G. Schnorrer-Kdhler(1986) New discoveriesin the Lau- P.J.Heaney, J.E. Post (1992) The widespreaddistribution rium slags.Lapis, I1,25-29 (in German). of a novel silica polymorph in microcrystalline quartz R. Edwards,R.D. Gillarad, P.A. Williams, A.M. Pollard varieties.Science, 255, 441-443. (1992) Studiesof secondarymineral formation in the The mineral occurs as microcrystalline silica fillings of PbO-H,O-HCIsystem. Mineral. Mag., 56, 53-65. cavities,fissures, and coolingcracks in someof the ignim- Lorettoite was describedas PbrOuCl,by Wells and Lar- brite flowsofthe MoganFormation, Gran Canaria.Chem- sen in 1916 (J. Wash.Acad. Sci.,6, 669-612\, bur was ical analysestypically give 2-3 wto/oHrO, 0.1-1.0 wto/o discreditedby White in 1979 (Am. Mineral., 64, 1303- COr, and the remainderSiOr; heatingexperiments indi- 1305) becauseall circumstancesindicated a manmade cate that the HrO is nonessentialand can be expelled 678 JAMBOR ET AL.: NEW MINERAL NAMES without destroying the structure. Appears macroscopi- refinement indicated a structure different from that of cally as translucent gray or brownish masseshaving a quafiz. Many of the crystallites also show a triclinic su- hardnessindistinguishable from that ofchalcedony.Op- perstructurewith a : 10.024,b: 9.752,c: 10.715, a: tically length slow, n : 1.524-1.531;apparently fibrous, 90.00,P : 90.07,7 : I 19.1l'. but revealedby SEM and TEM to be platesfrom 100 to X-ray examination,by Heaneyand Post,of more than 1000 A thick. Electron diffraction indicatesmonoclinic 150 specimensof fine-grainedquartz varietiesfrom around symmetry,space group 1 | 2/a l, a : 8.758(2), b : 4.876(l), the world showedthat > l0o/oand as much as 800/oof the c : r0.7r5(2) A, B : 90.09(3f,D-"." : 2.52-2.s8,D*t : silicain many samplescorresponds to moganite.The pur- 2.617 g/cm3with Z : 12.The powder patternconsists of est sample is from Gran Canaria. lines that appear as splits of quartz reflections and as Discussion.Previous descriptionswere abstractedin additionallines at d : 4.42,3.12,2.88,2.68,1.96, artd Am. Mineral.,70,p.874 (1985)and 75,p. 1435(1990). 1.74,which do not coincidewith any other known silica The name has not been approvedby the CNMMN and phase.Structural interpretation (R : 3.50/o)and Rietveld is not under current consideration.J.L.J.