Briartite

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.^[2]

Briartite
General
Category	Minerals
Formula	Cu2(Fe,Zn)GeS4
IMA symbol	Btt[1]
Strunz classification	02.KA.10(02)
Dana classification	2.9.2.3.(02)
Crystal system	Tetragonal
Space group	07;10
Unit cell	297.46 ų
Identification
Colour	Gray to gray blue; Iron-grey
Twinning	Polysynthetic
Mohs scale hardness	3.5–4.5
Luster	Metallic; Unpolished
Diaphaneity	Opaque
Specific gravity	4.337 (Calculated)
Density	4.337 g/cm3 (Calculated)
Common impurities	Ga, Sn

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.^[3]

Briartite is also found in Namibia, Greece, and Spain.^[4]

See also

• List of minerals
• List of minerals named after people