Mineralpedia Details for Geffroyite
Geffroyite
- Formula
- (Cu,Fe,Ag)9Se8
- Crystal System
- Isometric
- Luster
- Metallic
- Color
- bronze brown
- Class
- Isometric - Hexoctahedral
- Hardness
- 2.5
- WebMineral
- View Geffroyite
- Mindat
- View Geffroyite
Geffroyite from San Miguel mine, Moctezuma, Sonora, Mexico
Silvery crystal grains to 0.5mm and in aggregates to around 2mm. The Geffroyite is scattered throughout the matrix not just the arrowed areas.
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