Briartite


Composition: Cu2(Fe2+,Zn)GeS4
Crystal System : Tetragonal
Colours: Grey, grey-blue
Lustre : Metallic
Hardness (H) : 3.5-4.5
Specific Gravity (S.G) : 4.34
References: Gebhard (1999)

Distribution

Rare. Second oxidation zone (just above 30 Level).

Occurrence

  • Hypogene

Notable Finds

Masses of briartite (at the time unidentified) to 5 Kg were found just above 30 Level by Geier in 1955 (Gebhard, 1999).

Paragenetic and General Notes

Briartite is a rare, inconspicuous, grey mineral with a dull metallic sheen. It occurs either as ovoid masses in tennantite, germanite, and renierite and as minute inclusions in sphalerite, or it forms a very fine intergrowth with tennantite and renierite, in sphalerite (Keller, 1977). Please note that these textures are only visible in polished section, with reflected light microscopy.