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Download the Scanned American Mineralogist, Volume 77, pages 670475, 1992 NEW MINERAL NAMES* JonN L. J,Annson CANMET, 555 Booth Street,Ottawa, Ontario KIA OGl' Canada Abswurmbachite* rutile, hollandite, and manganoan cuprian clinochlore. The new name is for Irmgard Abs-Wurmbach, in recog- T. Reinecke,E. Tillmanns, H.-J. Bernhardt (1991)Abs- her contribution to the crystal chemistry, sta- wurmbachite, Cu'?*Mnl*[O8/SiOo],a new mineral of nition of physical properties ofbraunite. Type the braunite group: Natural occurrence,synthesis, and bility relations, and crystal structure.Neues Jahrb. Mineral. Abh., 163,ll7- material is in the Smithsonian Institution, Washington, r43. DC, and in the Institut fiir Mineralogie, Ruhr-Universitlit Bochum, Germany. J.L.J. The new mineral and cuprian braunit€ occur in brown- ish red piemontite-sursassitequartzites at Mount Ochi, near Karystos, Evvia, Greece, and in similar quartzites on the Vasilikon mountains near Apikia, Andros Island, Barstowite* Greece.An electron microprobe analysis (Andros mate- C.J. Stanley,G.C. Jones,A.D. Hart (1991) Barstowite, gave SiO, 9.8, TiO, rial; one of six for both localities) 3PbClr'PbCOr'HrO, a new mineral from BoundsClifl 0.61,Al,O3 0.60, Fe'O, 3.0,MnrO. 71.3,MgO 0.04,CuO St. Endellion,Cornwall. Mineral. Mag., 55, l2l-125. 12.5, sum 97.85 wto/o,corresponding to (CuStrMn3tu- Electron microprobe and CHN analysis gavePb75.47, Mgoo,)", oo(Mn3jrFe|jrAlo orTif.[nCuStr)", nrSi' o, for eight (calc.)6.03, sum 101.46wto/o, cations,ideally CuMnuSiO'r, the Cu analogueof braunite. Cl 18.67,C l.Iz,H 0.18,O to Pb.orClrrrCr.or- The range of Cu2* substitution for Mn2' is 0-42 molo/oin which for 17 atoms corresponds The min- cuprian braunite and 52-93 molo/oin abswurmbachite. H,nrOo,u,simplified as 3PbClr'PbCO3'HrO. intergrown crystals Occurs mostly as fibrous to elongateprismatic grains 6- eral occurs as subparallel, elongate (0.2-0.5 3 mm. Color and streak 50 pm long and 1-5 pm in diameter, and as subhedral mm) in aggrcgatesup to uneven fracture, imper- equant grains 5-30 pm in diameter, both in quatlz. white, luster adamantine,brittle, VHNrco: I I I (108- Opaque,black color, brownish black streak, metallic lus- fect prismatic cleavage,transparent, : D. 5.77g/cm3 with ter, brittle, vHNrr: 920(50) for synthetic material, D*" ll7), H: 3, D*"u" 5.50-5.69, 1": : bireflectant from : 4.96 g/cm3(synthetic material). In reflectedlight, gray, Z 2. In reflected light, moderately gray, colorlessinternal weak anisotropy, nonpleochroic, no internal reflection. gray to dark moderate anisotropy, values given in 20-nm steps Reflectancevalues (synthetic; SiC standard) for R, and reflection. Reflectance are for R, and R, in air R, in air arc 470 20.8,21.2; 546 19.6,20.0; 589 19.2, (SiC standard);representative values 470 13.5, 14.0,3.02, 3.311' 19.7;65018.7,19.2; in oil 4707.54,7.88;546 6.87 ,7 .16:' and in oil, respectively,are 589 12.65,13.1,2.67,2.92; 5896.56, 6.92; 650 6.24,6.58. 546 12.9,13.35,2.76,3.02; valuesfor R,, R, (illu- Single-crystalX-ray study of hydrothermally synthe- 650 12.4, 12.8,2.60,2.85. Color 13.3;)\d 477, 476; P"o/o3'5, sized material gave powder patterns similar to that of minant C, air) are Yo/o12.9, is to that of phosgen- braunite, and a Gandolfi pattern of natural material (0.62 3.7. The infrared spectrum similar indicated monoclinic sym- Cu pfu) showed only the strongestbraunite-type reflec- ite. X-ray single-crystalstudy group P2r/m, a : 4'218(2), b : tions at 2.70,2.13, 1.66,and l.4l A. Strongestlines of metry, space P2, or : 91.49(3f as refinedfrom synthetic material (0.98 Cu pfu) are 2.702(100,224), 9.180(2),c: 16.673($A, P pattern (Fe radiation). 2.350(15,040),2.133(15,235), 1.6507(30,048), 1.4159- a 114.6-mm Debye-Scherrer powder pattern 4.16(50,004), (14,264),and 1.4016(11,2.2.12),from whicha:9.406(l), Strongestlines ofthe are (60,007,026),2.29 6(80,040,1 25,106), c: 18.5a6(3),tetragonal symmetry, space group I4r/acd, 4.02(100,022),2.37 7 Z : L substitution of Mn2* by Cu2* results in a linear and 2.108(40,200). with phosgenite in a decreasein c and a nonlinear decreasein a. The infrared The mineral occurs in cavities quartz, dolomite, galena, spectrum is similar to that of braunite. vein, 15 cm wide, conlaining pyrite, chalcopyrite, and The mineral occurs in low-grade, high-pressuremeta- and minor cerussite, sphalerite, jamesonite, England. The ex- morphosed Mn-rich quartzitesin associationwith qrarlz, at Bounds Clifl Cornwall, part is water level, and the new min- shattuckite, tenorite, sursassite,piemontite, ardennite, posed of the vein at eral probably formed by reaction with seawater. The new name is for Richard William Barstow (1947-1982),Cor- * Before publication, minerals marked with an asterisk were The type specimenis in the British approved by the Commission on New Minerals and Mineral nish mineral dealer. Names, International Mineralogical Association. Museum (Natural History), London. J.L.J. 0003-004x/92l0506-0670$02.00 670 JAMBOR: NEW MINERAL NAMES 671 Coombsite* nant C (air),Yolo 15.9, 16.9;|\d475,472; P"o/o5.3, 8.9. T. Sameshima,Y. Kawachi (1991)Coombsite, Mn ana- Single-crystalX-ray study indicated orthorhombic sym- logue of zussmanite,and associatedMn-silicates, par- metry, space group Pma2, Pmam, or P2ram, s : settensiteand caryopilite, from southeastOtago, New 15.104(l),b:6.891(l), c: 5.806(1)A asrefined from Znaland.New Zealand Jour. Geol. Geophys., 34,329- a I14.6-mm Debye-Scherrerpattern (Fe radiation) with 335. strongest lines of 3.164(60,401), 3.135(60,220), 2.902(100,1 21,002), - Electron microprobe analysesgave SiO, 45.18, TiO, 2.76 6(100,5 10,22 l), and | .747 (60,313,721,531). 0.01,AlrO3 3.59, Fe asFeO 3.28,MnO 38.19,MgO 1.08, The mineral ptyg;matic-like CaO 0.03, NarO 0.08, KrO 2.19, sum 93.63 wt0/0,corre- occurs in veins of barite- calcite-jacobsite-hematite,in which it is also associated sponding to (K, o,Nooou)", or(Mn,, ,rFe, ooMgo rr)",...- with hausmannite, hematophanite, native copper, and a (Sir 6 4r All ro)r,,n, Oor(OH),0, ideally KMn, r(Si,Al),*Orr- lead molybdenum (OH),., the Mn analogueof zussmanite.Occurs as brown oxychloride. The assemblageoccurs in a manganeseore lens patchy aggregates,a few millimeters in diameter, com- at the Kombat mine, 49 km south of Tsumeb, Namibia. monly showing semispherulitic texture consisting of fi- The new name relates to the Da- mara sequence, brolamellar crystalsup to 20 pm long. D-."" : 3.0(l), D""b the dolostonesof which host the deposit. Type specimens : 3.063 g/cm3with Z : 3. Optically pale yellowish brown, are in the British Museum fNatural His- tory), uniaxialnegative, length slow, e : 1.600(l),<o : 1.619(l), and in the Institut liir Mineralogie und Kristall- very weakly pleochroic with co > e. The X-ray powder chemie, Universitiit Stuttgart. J.L.J. pattern, which closely resemblesthat of zussmanite,has strongestlines (diffractometer,CuKa) of 9.68(100,003), 4.8 3 5 (3 0, 006), 3.24| (25,009,207), 2.79 3 (7 0,30 6,3 | 2), Geminite* 2.556(90,315,401),and 2.241A(50,410,324). By analogy H. Sarp,P. Perroud(1990) Geminite, CurAsrOr.3HrO, to zussmanite,a: 11.828(2),c:29.146(9). a new mineral from the Cap Garonne mine, Var, France. The mineral occurs in a lenticular body of Mn-rich Schweiz. Mineral. Petrogr. Mitt., 70, 309-314 (in siliceousrock, about 0.5 x I m, in metagraywacke-argil- French, English abstract). lite transitional from pumpellyite-actinolite to the pum- pellyite-prehnite facies at Watsons Beach, southeastern Chemicaland TG analysisgave CuO 36.5,AsrO, 52.4, Otago, New Zealand. The lens consists mainly of rho- HrO 11.0, sum 99.9 wto/o,corresponding to Cu2o8- donite and quartz, with subordinate amounts of rhodo- As, ouO,24.2.7 6H2O, ideally CurAsrOr.3HrO. Occurs chrosite and traces of kutnohorite, manganoan calcite, abundantly as euhedral, intergrown crystals up to 0.3 x spessartine,apatite, parsettensite,caryopilite, and 0.06 mm on a specimenof quartz containing tennantite, coombsite. The new name is for D. S. Coombs of the covellite, chalcanthite, lavendulan, antlerite. and bro- University of Otago. Type material is in the Museum of chantite.Crystals are tabular {00 I }, slightly elongate[ 100], the Geology Department at the University of Otago and showing{001}, {100}, {010}, {rkO}, IhT{O},{hkj), and in the Smithsonian Institution, Washington, DC. J.L.J. {TEO).Transparent, light greento seagreen, vitreous lus- ter, pale green streak, nonfluorescent,irregular fracture, perfect {001} cleavage, H : 3-3.5, soluble in dilute HCI; twinned polysynthetically parallel to {001}, D-.," : : Damaraite* 3.70(2),D",": 3.71 g/cmr with Z 4. Optically biaxial positive,a: 1.656(2),P : 1.692(2),7: 1.770(5)at 590 A.J. Criddle, P. Keller, C.J. Stanley, (1990) J. Innes Da- nm;2V^*": 75(5)', 2V..t : 71", weak dispersionr > 4 maraite, a new lead oxychloride mineral from the weakly pleochroic a: 0 : colorless, ^y: pale green to Kombat mine, Namibia (South West Africa). Mineral. palegray; orientation a':(00 I = : -18.5, Mag.,54, 593-598.
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