Chemistry:Briartite

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Briartite
General
CategoryMineral
Formula
(repeating unit)
Cu2(Fe,Zn)GeS4
Strunz classification02.KA.10(02)
Dana classification2.9.2.3.(02)
Crystal systemTetragonal
Space group07;10
Unit cell297.46 ų
Identification
ColourGray to gray blue; Iron-grey
TwinningPolysynthetic
Mohs scale hardness3½ - 4½
|re|er}}Metallic; Unpolished
DiaphaneityOpaque
Specific gravity4.337 (Calculated)
Density4.337 g/cm3 (Calculated)
Common impuritiesGa, Sn

Briartite is an opaque iron-grey metallic sulfide mineral, Cu2(Zn,Fe)GeS4 with traces of Ga and Sn, found as inclusions in other germanium-gallium-bearing sulfides.[1]

It was discovered at the Prince Léopold Mine, Kipushi, Shaba, Congo (Léopoldville) in 1965 by Francotte and others, and named for Gaston Briart who had studied formations at Kipushi.[2]

Briartite is also found in Namibia, Greece, and Spain .[3]

See also

References