New Mineral Names*
American Mineralogist, Volume 77, pages446-452' 1992 NEW MINERAL NAMES* JonN L. Jlvrson CANMET, 555 Booth Street,Ottawa, Ontario KIA OGl, Canada Dlvro A. Ya,uro Department of Geology, Georgia State University, Atlanta, Georgia 30303, U.S.A. Native brass mitted light, white streak, adamantine luster, no fluores- cence,brittle, microhardness(10-g load) : 673 kg/cm2, M.G. Chebotarev,G.M. Chebotarev(1990) Native brass perfect cleavage.Optically biaxial negative, 2V : 20, u in gold sulfide ore deposits in Central Kyzylkum. Uz- : 1.997(5),positive elongation,dispersion bek. Geol.Zh.,1990(3),39-41 (in Russian). 1.936(5),t: r > v, no pleochroism,X : a, Y: b, Z: c. Analysis of the mineral by electron microprobe gave The name is for I. M. Cheremnykh, one of the discov- (averageof four,range) Cu 61.30,54.98-67.87;2n38.93, erers of the Kuranakh deposit. Type material is at the 34.7243.59 Fe 1.97, 0-4.06; sum 102.20wt0/0, corre- Institute of Geological SciencesMuseum, Yakutsk Sci- spondingto Cu, Both a-type and u-B-type ence Center, Siberian Branch, USSR Academy of Sci- ",FeoorZrt,,r. forms of brass are present. Greenish yellow in reflected ences. light. The mineral occurs as microscopic inclusions in pyrite from late-stagequartz-pyrite veins that cut Au- Kuksite bearing pyrite depositsin westernUzbekistan. Pyrrhotite Analysis by electron microprobe (averageof nine) gave and graphite-like carbonaceousmaterial are associated PbO 50.59, ZnO 20.76, CaO 1.46,TeO. 14.30,P,O' with the brass. A final note claims that contamination 10.38,VrO5 1.81, AsrO,0.07, SiOr 0.40, sum 99.77vtto/o, during production of polished thin sections cannot be correspondingto Pb, urZn,orCa" r, Teo nuPr r3vo 23sio o8O r3 eo, ruled out as the sourceof the "native brass." D.A.V.
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