American Mineralogist, Volume 74, pages 500-505, 1989 NEW MINERAL NAMESX JonN L. J.runon CANMET, 555 Booth Street,Ottawa, Ontario KIA 0G1, Canada J,tcnx Puztnwtcz Institut fiir Mineralogie, Universitet Hannover, D-3000, Hannover 1, Federal Republic ofGermany S (S) 6.1I, polysulfideS (S")7.25, thiosulfateS (S) 6.20, Abhurite* HrO (hydroxyl) 9.46, H,O (molecular)31.20, O 12.20, J.T. Matzko, H.T. Evans,Jr., M.E. Mrose,P. Aruscavage total I00.00 wto/0,corresponding to Ca(Stu,Si'r)ro*Ca- (1985) Abhurite, a new tin hydroxychloride mineral, (S1rrO, oo)' Ca6 oo(OH),2 20' 20. I 4HrO. The mineral forms and a comparative study with a synthetic basic tin chlo- aggregatesup to I cm in diameter, orangeto yellow, light ride. Can. Mineral., 23,233-240. yellow streak,vitreous luster; intergrowths ofparallel plates Chemical analysisgave Sn 73.4, Cl 15.7, O 11.0, H have a pearly luster. Crystalsare bladesup to 5 mm long, 0.4, sum 100.5 wto/o;the ideal formula SnrO(OH)rCl re- flattenedon {010), elongate[001], with {ll0} edgesand quiresSn 74.6,Cl 14.9,O 10.1,H 0.4 wto/o.The mineral rerminaredby {01l}, {l0l}, and {l I l}. Thin crystalsare occurs as cryptocrystalline crusts and as platy hexagonal transparent,and coarsergrains are transparent to trans- crystals that average 1.5 mm in diameter. Colorless, lucent. Fracture uneven,very good {010} cleavage,brittle transparent with opalescentluster, white streak, hackly but elasticin thin leaves,H: 2, r-.." : 1.83(l), D"",": fracture, H: 2, dissolvesslowly in HCI and HNO3, D*"". 1.845g/cm3 withZ: 1. No luminescencein ultraviolet : 4.29 (pycnometer),D"r": 4.35 g/cm3 with Z : 21. Iight (360 nm). Decomposesin water, giving S and a white Crystalsare platy to tabular on hexagonal(0001), twinned porous residuum; decomposesin HCI to give S and HrS. on (0001), and have rhombohedral forms {0115} and Slowly hydrolyzes in air, gradually becoming colorless {0001}. Optically uniaxial positive,o: : 2.06,e : -2.11. with a weak bluish tint, preservingthe transparency.Hy- Single-crystalX-ray study indicated rhombohedral sym- drolyzed pseudomorphstypically have porous aggregates metry, spacegroup R3m, R3m, or R32 the refined Gui- of S on their surfaces.The DTA curve shows a strong nier-Hiigg powder pattern (CuKa,) gave hexagonal pa- endothermaleffect at 140"C (lossof molecularwatet,37.7 'C rametersa : 10.0175(3),c:44.014(2) A, and strongest wto/o),a distinct exothermal one at 365 (loss of sulfidic lines of 4.1 39(50X1 l 6), 3.404(50X208),3.27 r(35)(2rr), and polysulfidic sulfur, 13.4 wIo/o),and an endothermal 3.244(3s)(r22), 3.r42(3s)(2r4), 2.9074(35)(217), one at 495 "C (loss of hydroxyl water, 16.2 wt0/0).Addi- 2.8915(70X300),2.8175(50X128), 2.5313(100)(l 1.15), tional weight loss at higher temperatures is 4.80/0.The and 1.8928(3sX4l0). infrared spectrum shows absorption bands at 810 (HrO), Abhurite occurs as blisterlike protuberancesthat formed ll00 (SO and S,O,), 1630 (H,O), and 3300 (OH) cm-'. as a corrosion product of tin ingots recovered from the Opticallybiaxial positive, a: 1.595(2),B : 1.619(2),7 cargoofa sunkenship, wreckedpossibly 100 yr ago,lying : 1.697(3)(white light), a: Y, b : X, c A Z : 30",2V.,," in a Red Seacove known as Sharm Abhur, about 30 km : 60'20'. Strong pleochroism: X deep green-yellow, Y north of Jiddah, Saudi Arabia. Associated minerals are greenish-yellow,Z palegreenish-yellow, X > Z > Y. Sin- romarchite, kutnohorite, and aragonite. Specimens of gle-crystal X-ray study shows the mineral to be mono- abhurite are in the Smithsonian Institution, Washington, clinic,space group P2,/c, a: 8.45(l),b: 17.47(l),c: D.C., and in the Royal Ontario Museum, Toronto, On- 8.24(l), B : I19.5". Strongestlines of the powder pattern tario. J.L.J. (57.3-mmcamera) are 8.76(100X020),4.39 (100X040), 2.91 (60X060), 2.8 l(50X240), 2.62(s0)(r22),2.28(50)(260), and 1.996(70)(162).The X-ray pattern of the mineral is Bazhenovitex similar to that of its synthetic orthorhombic analogue. B.V. Chesnokov,V.O. Polyakov,A.F. Bushmakin(1987) The crystal structure of the mineral is layered, with Bazhenovite CaSr.CaSrO.. 6Ca(OH)r. 20HrO-A new Ca(OH)r, polysulfide, and water-bearinglayers parallel to mineral. Z,apiskiVses. Mineralog. Obshch., 116,737- {010}. 743 (it Russian). Bazhenovite is associatedwith native iron, native sul- periclase Wet-chemical analysis combined with rc results (water) fur, oldhamite, troilite, pyrrhotite, fluorite, and prod- and corrected for impurities (Fe) gave Ca 27.58, sulfide in altered pyritized siderite fragmentsin the melted ucts of old, burning coal dumps of the Chelyabinsk coal basin, south Ural Mountains, USSR. The name is for A. Bazhenov (petrographer)and L. F. Bazhenova (ana- * Prior to publication, minerals marked with an asteriskwere G. approved by the Commission on New Minerals and Mineral lytical chemist). Type material is in the Fersman Min- Names, International Mineralogical Association. eralogicalMuseum, Moscow. J.P. 0003-o04x/89/0304-0500$02.00 s00 JAMBOR AND PUZIEWICZ: NEW MINERAL NAMES 501 Cesplumtantite* north of Mingary and on the Adelaide-Broken Hill rail- A.V. Voloshin, Ya. A. Pakhomovskii, A. Yu. Bakhchis- way about 470 km from Adelaide. The holotype specimen araitsev,N.N. Devnina (1986)Cesplumtantite-A new (M32479) is in the Museum of Victoria, Melbourne, Aus- cesium-leadtantalate from granitic pegmatites.Miner- tralia. J.L.J. alog.Zhurnal 8(5), 92-98 (in Russian). Microprobeanalysis (3 given)gave TarO, 63.85,NbrO, Ecandrewsite* 3.24,CsrO5.37, Na,O 0.71, CaO 0.83, PbO 20.24,5b,O3 2.88, SnO, (calculated)1.60, sum 100.21 wt0/0,corre- W.D. Birch,E.A.J. Burke, V.J. Wall, M.A. Etheridge(1988) Ecandrewsite,the zinc analogueof ilmenite, from Little sponding to (CsonrNao ruCao.u)r, ss(Pbr rrsbflj8 Snfijr),rrr- Broken Hill, New South Wales, Australia, and the San (Ta, orNbou$nt;u)r, nrOro,ideally (Cs,Na)r(pb,Sb3*)3Ta8O24 Valentin Mine, Sierra de Cartegena,Spain. Mineral. with Cs > N4 Pb > Sb. X-ray powder study shows the Mag., 52,237-240. mineralto be tetragonal,a: 13.552(8),c : 6.445(l A, Z : 2. The strongest X-ray lines (35 given) are Four electron-microprobeanalyses of the mineral from 6.l l (50)(21 0), 3.I 9(50X330),3.054( I 00)(t| 2), 2.037(s0, the type locality, the Melbourne Rockwell mine at Little diffuse)(621),1.869(70X323), 1.593(70X821), and Broken Hill (13 km southeastof the main Broken Hill I . 18 I (50X654).The mineral is colorless,transparent, white deposit, New South Wales),gave TiO, 50.12-52.45,FeO streak, adamantine luster. No cleavageobserved. Micro- 8.8- I 3.6 5, MnO 4.4-7.64, ZnO 28.5-3 5.05, toral 98. 8 5- hardness1240 kg/mm, (40 g load). D."b : 6.87(5)g/cm'. 100.0wto/0, correspondingto (Zno ss. 6sFeo,n- ,oMno,o_o ,r)- Light gray in reflectedlight, weak bireflectance,no pleoch- Ti.ee-r0303,ideally ZnTiOr,theZn analogueof ilmenite. roism or internal reflection. Strongly anisotropic, with At the type locality the mineral occursas euhedraltabular complex polysynthetic twinning. Reflectancevalues (nm, grains,up to 50 by 150pm. Physicaland optical properties o/o) in air (Si standard)are 47 6, 18.2,17 .l ; 55 3, I 7.3, I 6.5; are similar to those of ilmenite: dark brown to black color 589,17.1, 16.5;656,15.6, 15.3. and streak, submetallic luster, VH,oo: 500-600 kg/mrn2, Cesplumtantite was found in a museum specimen of no cleavageor twinning, D.,,: 4.99 g/cm3with Z: 6. thoreaulite in granitic pegmatitefrom Manono, Zaire. The In reflectedlight, grayish-whitewith a pinkish tinge, weak new mineral occurs as veinlets ofelongate aggregatesup reflection pleochroism in air, strongly anisotropic from to 0.3 mm long and is associatedwith lithiotantite, cas- greenish-grayto dark brownish-gray. Reflectancevalues siterite, calciotantite, and microlite. The name alludes to in air (SiC standard) for R. and R. are 470, 19.2-19.9, the chemical composition. The type specimen is at the 17.2-17.7;546, 19.0-19.7,17.2-17.6; 589, 18.9-19.6, Museum of the Leningrad Mining Institute, Leningrad, 17.0-17 .6;650, 18.7-19.2,16.8-17 .5. X-ray crystal-struc- USSR.J.P. ture study indicated rhombohedral symmetry, spacegroup Cobaltaustinite* R3, hexagonalcell dimensions 4 : 5.090(l), c : 14.036(2) A. Strongest lines of the powder pattern arc 2.73- E.H. Nickel, W.D. Birch (1988)Cobaltaustinite-A new (r00x1014),2.53(90)(l r20), 2.23(60x1 123), 1.87(40)- arsenatemineral from Dome Rock, South Australia. (0224), Austral. Mineral., 3, 53-57. and 1.71(70)(1126),inclose agreemenr wirh data for syntheticZnTiO, (PDF 26-1500). Electron-microprobe analysis gave CaO 22.4, CoO At the type locality the mineral is disseminated in quartz- 25.8,CuO 2.5, AsrO,46.l, PrO,0.3, SO3 0.3, HrO (CHN rich metasedimentaryrocks of amphibolite-granulite fa- analysis) 3.6, sum l0l.I wt0/0,corresponding to cies and coexists with almandine-spessartine,ferroan Ca,o,CoorrCuoorAs, o,Poo,Soo,O._06(OH), 0,, simplified as gahnite, and rutile. Associatedamphibolites contain zin- Ca(Co,CuXAs,P,S)Oo(OH)and ideally CaCoAsOo(OH). cian ilmenite.