Terrywallaceite from the Kochkar au deposit, South Urals: first find in Russia
A.V. Kasatkin, R. Škoda
UDK 549.352 (470.55) | https://doi.org/10.35597/2313-545X-2020-6-1-4 | Read PDF (RUS) |
Terrywallaceite, AgPb(Sb,Bi)3S6, a rare sulfosalt of the lillianite homologous series, was found in a sample from the Kochkar Au deposit (Chelyabinsk oblast). It occurs as anhedral grains up to 0.4 × 0.3 mm and is associated with Sb-bearing bismuthinite, tetrahedrite-(Fe), arsenopyrite and minerals of the tintinaite–kobellite series. Its average empirical formula based on eight analyses is as follows: (Ag0.97Cu0.07)Σ1.04(Pb0.94Cd0.02)Σ0.96(Bi1.84Sb1.17)Σ3.01 (S5.99Se0.01)Σ6.00.The monoclinic unit cell dimensions are a = 6.992(2), b = 19.328(4), c = 8.381(10) Å, β = 107.68(7)°, V = 1079(1)ų. This is the first reliable find of the mineral in Russia.
Figures 3. Tables 3. References 24.
Key words: terrywallaceite, Kochkar Au deposit, South Urals, first find of mineral in Russia,
lillianite homologous series.
A.V. Kasatkin, Fersman Mineralogical Museum of RAS, Leninskiy Pr. 18/2, Moscow, 119071 Russia; anatoly.kasatkin@gmail.co
R. Škoda, Masaryk University, Kotlářská 2, Brno, 61137 Czech Republic
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MINERALOGY № 1 2020