Calaverite Composition, Crystallization and Structure

Composition. Gold telluride, AuTe2 = tellurium  55. 97, good 44.03. Silver usually present isomorphous with the gold, to a small extent.

Crystallization. Monoclinic. Crystals usually develop parallel to the ortho-axis and the faces of the orthodome zone deeply striated. Terminated at the ortho-axis with a large number of faces. Crystallization complicated. Twining frequent.

Structure. Usually granular. Distinct crystals rare.

Physical properties. H. = 2.5. G. = 9.35. Metallic luster. Silver-write color, sometimes with yellowish tarnish. Streak. Gray.

Test. Easily fusible (1) if a little of the powdered mineral is heated in concentrated sulfuric acid the solution assumes a deep red color (telluriñum). When decomposed by nitric aid laves a rusty-colored, spongy mass of gold, and on addition of hydrochloric aid gives only a sgliht precipitate of silver chloride. Distinguished from sylvanite by small amounts of silver presnt and by its lack of a cleavage.

Occurrence. Found with sylvanite and other tellurides in the Cripples Creek Districtic, Colorado, and at Kalgoorlie, West Australia. 

Name. found originally at the Stanislaus Mine, Calaveras County, California, whence name.

Use. An ore of gold.

Other rare tellurides belonging to this group are krnnerite, AuT22, and nagyagite, a sulpho-tellurides of lead and gold

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