Abstract
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.
Publisher
South Urals Federal Research Center for Mineralogy and Geoecology of the Urals Branch of the RAS
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