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American Mineralogist; August 1998; v. 83; no. 7-8; p. 901-906
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Sorosite, Cu(Sn,Sb), a new mineral from the Baimka placer deposit, western Chukotka, Russian Far East

Andrei Y. Barkov, Kauko V. O. Laajoki, Stanislav S. Gornostayev, Yakov A. Pakhomovskii, and Yuri P. Men'shikov

University of Oulu, Institute of Geosciences, Oulu, Finland

Sorosite, ideally Cu(Sn,Sb), is a new mineral species from the Baimka gold-platinum-group mineral placer deposit, Chukotka, Russian Far East. It occurs as large subhedral to euhedral crystals (0.1-0.4 mm in length), hexagonal in cross section, minute crystals (< or =15 mu m, also hexagonal), and anhedral grains. Sorosite forms inclusions in Sb-bearing native tin, is often intergrown with stistaite (Sn (sub 1.12-1.13) Sb (sub 0.87-0.88) ) and occurs with herzenbergite (SnS), native lead, and trace cassiterite. Sorosite is brittle with a microhardness VHN (sub 40.50) = 443.7 kg/mm 2 (n = 3). No cleavage is observed. In reflected light, the large crystals are nearly white with a pinkish tint, whereas the microcrystals show a pronounced pinkish tint. Bireflectance is variable. The average of nine electron microprobe analyses gave Cu 35.33, Fe 1.18, Sn 58.18, and Sb 4.77, sum 99.46 wt%, corresponding to (Cu (sub 1.00) Fe (sub 0.04) ) (sub Sigma 1.04) (Sn (sub 0.89) Sb (sub 0.07) ) (sub Sigma 0.96) . The powder pattern is close to those of natural Cu(Sn,Sb) and synthetic eta -Cu 6 Sn 5 ; it was indexed for a hexagonal cell, with a = 4.217(4) Aa, c = 5.120(6) Aa, and V = 78.85 Aa 3 . For Z = 2, the calculated density is 7.6 g/cm 3 . The strongest lines in the pattern are at 2.970 (011), 2.112 (110), and 2.094 Aa (012). The sorosite-bearing mineral assemblage apparently formed under low f O2 and f S2 conditions.

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