Argyrodite

argyrodite

noun
a rare steel-grey mineral consisting of silver and germanium and sulfur 
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Encyclopedia Britannica
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argyrodite

heavy, dark sulfosalt mineral, a silver and germanium sulfide (Ag8GeS6), in which the element germanium was discovered (1886). It is a relatively scarce mineral found in sulfide veins in Germany and in Bolivia. It forms a solid solution series with canfieldite in which tin replaces germanium in the crystal structure, which belongs to the isometric system. For detailed physical properties, see sulfosalt (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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