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Briartite

Briartite is an opaque iron-grey metallic lustrous sulfurous crystalline stannite mineral found as inclusions in other Germanium-Gallium-bearing sulfides[?].

It was discovered at the Prince Leopold Mine[?], Kipushi, Shaba, Zaire in 1965 by Francotte[?] and others, and named for Gaston Briart who had studied formations at Kipushi[?].

Briartite is also found in Namibia, Greece, and Spain.

Chemical Formula: Cu₂ (Zn,Fe) Ge S₄ with traces of Ga;Sn

See American Mineralogist[?], volume 051, pp. 1816(1966); American Mineralogist, volume 080, pp. 849(1995)

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