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New Mineral Names E55

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New Mineral Names E55 American Mineralogist, Volume 67, pages 854-860, l,982 NEW MINBRAL NAMES* MrcHa.Br-FrerscHen, G. Y. CHeo ANDJ. A. MeNoenrNo Arsenocrandallite* Although single-crystal X-ray ditrraction study showed no departure from cubic symmetry, the burtite unit Kurt Walenta (1981)Minerals of the beudantite-crandallitegroup cell is consid- eredto be rhombohedralwith space-groupR3, a,6 = 8.128A,a = from the Black Forest: Arsenocrandallite and sulfate-free 90', Z = 4 (a : 11.49,c : 14.08Ain hexagonalserting). weilerite. Schweiz. Mineralog. petrog. Mitt., 61,23_35 (in The German). strongestlines in the X-ray powder ditrraction pattern are (in A, for CoKa, indexing is based on the pseudo-cubic cell): Microprobe analysis gave As2O522.9, p2}s 10.7, Al2O32g.7, 4.06(v sX200), I .E I 4(s)(420),1.657 (s)@22), 0. 9850(sX820,644) and Fe2O31.2, CaO 6.9, SrO 6.0, BaO 4.3, CuO 1.8,ZnO 0.3,Bi2O3 0.9576(sX822,660). 2.4, SiO2 3.2, H2O (loss on ignition) 11.7, sum l}}.lVo cor_ Electron microprobe analysis(with HrO calculatedto provide responding to (Ca6.5,,S16.2eBas.1aBir.65)1.6e(Al2.7eCus.11Fefifl7 the stoichiometric quantity of OH) gave SnO256.3, CaO 20.6, Zno.oz)r.gs(Aso.ss P6.75Si6.26) z.oo He.cq O13.63,or MgO 0.3, H2O 20.2, total 97.4 wt.Vo. These data give an (Ca,Sr)Al:Ht(As,P)Oal2(OH)6. Spectrographicanalysis showed empirical formula of (Canes2Mga oro)>r.oozSno ngn(OH)6 or, ideal- small amounts of Na, K, and Cl. A second sampleis nearly free ly, CaSn(OH)6. of Ba and P. The mineral is partly dissolved by cold l: I HCI or Burtite occurs in a garnetite in a tin skarn at33.31,26"Long., HNO3, dissolvedslowly by hot l:l HCl. 5"49'50' Lat. on the west bank of the Beht River in central The strongest X-ray lines (21 given) are 5.g4(l0Tl,lll), Morocco. Associatedminerals are: wickmanite, stokesite, dato- 3.55(9Xl120, l0l4), 2.e9(r0d)(o2Tt,I 123,0115), 1.srs lite, pectolite, a member of the apophyllite group, varlamoffite, (5)(1235,0227,0009),1.769(6X2240,2028). calculated cell con- andradite, wollastonite, malayaite, clinopyroxene and loellin- stants are: hexagonalsetting a = 7.08, c = 17.274.,Z = 3: gite. rhombohedralsetting a = 7.06A, a 60.18.,Z : l, the second The nameis for Prof. Donald M. Burt, Arizona State Universi- samplehada:7.06, c = 17.224.,ora = 7.MA, o 60.19". ty. Type material is preserved at the Universitd catholique de The mineral forms reniform crusts and spherulitic aggregates Louvain, LouvainJa-Neuve,Belgium. J.A.M. up to 0.1 mm. Color blue to bluish-green,luster vitreous. No cleavage,fracture conchoidal, H - 5V2,D meas.f.25+0.1, calc. 3.30.Isotropic to weakly birefringent, = n(average) 1.625+0.01, Caswellsilverite* but rarely down to 1.600and up to 1.650.Under the microscope may show triangular sectors. A. Okadaand Klaus Keil, Caswellsilverite(1981) NaCrS2, a new The mineral was found on old dumps jn the Neubulach mining mineral in the Norton County enstatite achondrite. Meteorit- district, Black Forest, Germany, associated with brochantite, ics, 16,370-371 (abs.). chalcophyllite, parnauite, arseniosiderite,mansfieldite, and cor- roded tennantite. Electronmicroprobe analysis gave S 46.3,Cr 37.4, Ti 0.18, Mn 0.08, Na 15.7, total 99.7Vo, corresponding to NaCrS2. X-ray The name is for the composition and relation to crandallite. M.F. study showsit to be trigonal, spacegroup RTm, a = 3.55,c = 19.5A. (hexagonal setting). The strongest X-ray lines are 6.49(7)(003),2.60(10)(014), 2.07(E)(017), 1.910(8)(108), 1.779(8Xl l0), r.46s(6)(204), Burtite* l. I 34(6X0.l. 16). The mineral occurs in anhedral grains up to I mm in size, P. M. Sonnet (1981)Burtite, calcium hexahydroxostannate,a associatedwith daubreelite,titanian troilite, alabandite,penyite, new mineral from El Hamman, central Morocco. Can. Miner_ and another Na-Cr sulfide. Yellowish-gray to light gray, luster al., 19, 197-401. metallic. Pleochroic, O pale yellow, E gray in air; O pale greenish yellow, E dark gray in oil. The mineral occurs as octahedra (up to 2 mm across)with an The nameis for CaswellSilver, U. S. Geologist.M.F. earthy, yellow surface caused by alteration to varlamoffite. Burtite is colorless, has a vitreous luster, is very brittle with H about 3. It is non-fluorescentin ultraviolet light and has a good cubic cleavage.D meas. 3.28(l), calc. 3.22. Optically, burtite Chromium* appearsto be isotropic with n = 1.633but thick grains are very Yue Suchin, Wang Wenying and Sun Sujing (1981) A new weakly birefringent and show uniaxial positive interference mineral-native chromium. Kexue Tongbao, 26, 959-960 (tn figures. Chinese). Analysisgave Cr 98.01,Fe 0.001,Cu 0.366.Zn 1.40.sum 9.78Vo,corresponding to xMinerals Cr 98.59,Zn 1.12,Cu 0.28 atomicVo. marked with asterisks were approved before publi- Cu and Zn are probably in substitution for Cr. The material is cation by the Commissionon New Minerals and Mineral Names homogeneous,showing no evidenceof exsolution, under reflect- of the International Mineralogical Association. ing and electron microscopes. 0003-004)v82l0708-0854$00.50 854 NEW MINERAL NAMES E55 The mineral is white with a yellow tint under reflected light. It itiesgave Bi 68.E-73.3,Pb 0-1.2, Sb 0-0. I 5, Te 19.3-25'3'S 5.l- is isotropic without internal reflection. Reflectancedata are 480 6.3, Se 0-0.4, sum 99.1-100.3Vo,giving the formula above. nm, 65.3;546 nm, 67.9, 589nm, 68.E,656 nm,70.0Vo. X-ray study showed the mineral to be hexagonal,space group The mineral occurs in artificial heavy sandsof massiveores in P3m,P\ml, or P321,a : 4.248,c : 23.224,Z = 9,D calc.7.88. the contact zone between ultrabasic rocks and siliceous marble Weak lines indicate that the value of c should be tripled. The in Sichuan, China. The mineral is finely granular (grain size strongestX-ray lines (35 given) are 3.11(10)(1.0.1.12)' about 20 pm), closely associated with another new mineral 2.28(6)(r.0f.24), 2.13(5Xl lZ0) , and 1.942(4)(0.0.0.36). Clu^Zn2(Ct 32.52, Zn 67.47, sum 99.99%,or Cu1662n2 s16). The Ingodite is silver-white, luster metallic, cleavageperfect, non- mineral CuZn2 forms rims around chromium. Other associated magnetic,brittle, soft. H on 2 samples64.6 and 60.9 kg/sq. mm' mineralsare pyrrhotite, pentlanditechalcopyrite, pyrite sulfoar- In reflectedlight white, birefringencenoticeable in air (creamyto senides and platinum group minerals. The name is for the grayish-white), moderately anisotropic. Reflectancesare given composition.G.Y.C. at 15wave lengths(R" and Ro):(av. of 2) 460nm, 55.5,51.4; 540 nm, 57.7,52.5;580 nm, 57.8,52.4;660 nm, 56'9,5l.6Vo' The name is for the localitY. M.F. Gruzdevite* E. P. Spiridonov,L. Ya, Krapiva, A. K., Gapeev,V. I. Stepa- Karnaishilite* nov, E. Ya. Prushinskaya,and V. Yu. Volgin (1981)Gruzde- vite, Cu5Hg3SbaSl2,a n€w mineral from the Chauvai antimo- Etsuo Uchida and J. T. Iiyama (1981) On kamaishilite, ny-mercury deposit, Central Asia. Doklady Akad. Nauk CazAlzSiOo(OH)2,a new mineral (tetragonal), dimorphous SSSR,261, 971-976 (in Russian). with bicchulite, from the Kamaishi Mine, Japan. Proc. Japan Acad..57B.239-243. Electron microprobe analyses by E.P.S. on 6 samples gave (rangeand average)S 20.29-20.91,20.44; Sb 25.29-27.22, 26.21; Microprobe analysis (HzO by wet chemical analysis) gave As 0.06-0.57,0.37 ; Hg 32.23-33.23,32.7 3 ; Fe trace-0.40,0.29 ; SiO220.03, Al2O3 34.15, FeO 0.21,MgO 0.02,CaO 37.42,H2O* Cu 19.26-20.77,19.99, sum 98.93-101.00,100.03Vo. The average 6.1, HrO- 0.2, sum 98j3%, correspondingto Ca1eeFee6l) correspondsto (Cu5s7Fe6.16)Hg3 sa(Sba 61As6.oe)S1 1.6e. A com- Al2 oosioeeo5 ss(OH)z 02 or Ca2Al2SiO6(OH)2,a dimorph of bic- plete series exists from gruzdevite to aktashite, Cu6Hg3AsaS12 chulite. : (58,562 (1973)). Gruzedevite is isotypicwith nowackiite. X-ray powder data are indexed on a tetragonal cell with a X-ray study showsgruzdevite to be rhombohedral, a = 13.902, 8.850,c = 8.7704.,Z = 4. The strongestX-ray lines (28 given) c = 9,4324.,2:3, a,nE.6094.,a 107"41',2: l,D calc.5.88. are 3.607(I 00)(2rr,r 12), 2.799(85X310, 30r), 2.777 (40)(103)' The strongest X-ray lines (50 given) are 3.16(10)(311,003), 2.s47 (40)(222), 2.085(30)(3 30,4 I I ), I .557(35X404). r.929(9\(s20,314),1.645(8)(62r,s23,31s), r.2sr(s) The mineral occurs as grains about 0.1 mm in diameter. (65r,9 | r,625,317), 1 . r l 3(6X654,9 l 4,3 l 8, r 0. l .2). Colorlessand transparent.No cleavagewas observed. Optically In reflectedlight the mineral resemblesaktashite, tetrahedrite, nearly isotropic, n : 1.629, close to that of bicchulite. No and metacinnabar.Anisotropy weak, AR - 0.06. Reflectances conoscopicinterference figure was observed. are given at 8 wavelengths,R-"* = 460nm, 33.1;540 nm, 32.8; The mineral occurs in vesuvianite skarn, associated with 580nm, 32.7;660nm, 3t.9Vo.Microhardness295t5 kg/sq.mm at vesuvianite, "hydrograndite", and small amounts of perovskite, 30 g load.
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