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Sorosite, ideally Cu(Sn 5 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 (≤ 15 μm, also hexagonal), and anhedral grains. Sorosite forms inclusions in Sb-bearing native tin, is often intergrown with stistaite (Sn 1.12 - 1.13 Sb 0.87 - 0.88 ) and occurs with herzenbergite (SnS), native lead, and trace cassiterite. Sorosite is brittle with a microhardness VHN 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 1.00 Fe 0.04 ) ∑1.04  (Sn 0.89 Sb 0.07 ) ∑0.96 . The powder pattern is close to those of natural Cu(Sn,Sb) and synthetic η-Cu 6 Sn 5 ; it was indexed for a hexagonal cell, with a = 4.217(4) Å, c = 5.120(6) Å, and V = 78.85 Å 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 Å (012). The sorosite-bearing mineral assemblage apparently formed under low f O₂  and f S₂  conditions.

Sorosite, Cu(Sn,Sb), a new mineral from the Baimka placer deposit, western Chukotka, Russian Far East