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Viktoria Klett
A new mineral identical with the intermetallic compound AuSb2 has been found in gold ores from the Giant Yellowknife mine, Northwest Territories, and from the Chesterville mine, Larder Lake, Ontario. In the former locality it occurs in dolomitic carbonate and quartz with gold, frcibergite, stibnite, jamesonite, chalcostibitc, bournonite, arsenopyrite, pyrite, chalcopyrite, and sphalerite; in the latter in quartz with gold, freibergite, galena, tennantite, bournonite, chalcopyrite, sphalerite, arsenopyrite, gersdorffite, and pyrite. In polished section the mineral is galena-like with a slight pinkish tinge; in hand specimen minute anhedral grains show a bomite-like tarnish. The standard etch reactions in the order of reactivity are: HNO3, FeCl3, HCl, KOH positive; HgCl2, and KCN negative. The hardness is C-. The composition of the mineral was determined by comparing its x-ray powder pattern with that of the synthetic compound, and was checked by microchemical tests. The crystal structure is pyrite type; the unit cell containing Au4Sb8 has a=6.646 0.003 kX (synthetic 6.644 0.003 kX); the single Sb parameter is 0.386 0.007. The calculated gravity is 9.91 compared with 9.98 measured on synthetic material.