Silver sulfoselenide from ore of the Valunisty Au-Ag deposit, Chukchi Peninsula
Tóm tắt
Silver sulfoselenide (Ag,Cu)9Se2S4 from ore of the Valunisty Au-Ag deposit on the Chukchi Peninsula is described for the first time. The mineral occurs in mineralized quartz-adularia veins, where it associates with chalcopyrite, sphalerite, galena, and electrum and replaces arsenpolybasite. It forms anhedral grains up to 0.2 mm in size. The reflectivity of sulfoselenide is moderate, no anisotropy is observed, and the microhardness is very low. The chemical composition of the mineral differs from other known members of the Ag-Se-Se-S system: the S/Se ratio of the mineral is 2/1 and the (Ag + Cu)/(Se + S) ratio is about 1.5.
Tài liệu tham khảo
Andreeva, E.S., Proekt poiskovykh i otsenochnykh rabot na Kanchalano-Amguemskoi perspektivnoi ploshchadi na 2001–2007 gg. (Project of Prospecting and Evaluation at the Kanchalan-Amguem Prospective Area for 2001–2007), Moscow, 2007.
Charykova, M.V., Krivovichev, V.G., and Depmaier, V., Fiziko-khimicheskoe modelirovanie povedeniya selena v pripoverkhnostnykh usloviyakh (Physicochemical Modeling of Selenium Deportment at Shallow Conditions), St. Petersburg: St. Petersburg State Univ., 2007.
Fleisher, M. and Mandarino, J., Glossary of Mineral Species, Tucson: The Mineralogical Record Inc., 1995.
Petruk, W. and Owens, D., Some Mineralogical Characteristics of the Silver Deposits in the Guanajuato Mining District, Mexico, Econ. Geol., 1974, vol. 69, no. 7, pp. 1078–1085.
Pertruk, W., Owens, D., Stewart, J.M., and Murray, E.J., Observations on Acanthite, Aguilarite, and Naumannite, Can. Mineral., 1974, vol. 12, no. 6, pp. 365–369.
Simon, G. and Essene, E.J., Phase Relations Among Selenides, Sulfides, Tellurides and Oxides: I. Thermodynamic Properties and Calculated Equilibria, Econ. Geol., 1996, vol. 91, no. 7, pp. 1183–1208.
Warmada, I.W., Lehmann, B., and Simandjuntak, M., Polymetallic Sulfides and Sulfosalts of the Pongkor Epithermal Gold-Silver Deposit, Wet Java, Indonesia, Can. Mineral., 2003, vol. 41, no. 1, pp. 185–200.