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ARGYRODITE

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Originally appearing in Volume V02, Page 488 of the 1911 Encyclopedia Britannica.
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ARGYRODITE , a See also:

mineral which is of See also:interest as being that in which the See also:element See also:germanium was discovered by C. Winkler in 1886. It is a See also:silver sulpho-germanate, Ag8GeS6, and crystallizes in the cubic See also:system. The crystals have the See also:form of the See also:octahedron or rhombic See also:dodecahedron, and are frequently twinned. The botryoidal crusts of small indistinct crystals first found in a silver mine at See also:Freiberg in See also:Saxony were originally thought to be See also:monoclinic, but were afterwards proved to be identical with the more distinctly See also:developed crystals recently found in See also:Bolivia. The See also:colour is See also:iron-See also:black with a purplish tinge, and the lustre metallic: There is no cleavage; hardness 21, specific gravity 6.2. It is of interest to See also:note that the Freiberg mineral was See also:long ago imperfectly described by A. Breithaupt under the name Plusinglanz, and that the Bolivian crystals were incorrectly described in 1849 as crystallized brongniardite. The name argyrodite is from the See also:Greek apyupWhrls, See also:rich in silver. Isomorphous with argyrodite is the corresponding See also:tin See also:compound AgsSnS6, also found in Bolivia as cubic crystals, and known by the name canfieldite. Other Bolivian crystals are intermediate in See also:composition between argyrodite and canfieldite. (L.

J.

End of Article: ARGYRODITE

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