Tetrahedrite
Image: <a href="//commons.wikimedia.org/wiki/User:Iifar" title="User:Iifar">Ivar Leidus</a> (CC BY-SA 4.0)
Mineral NameTetrahedrite
Chemical Formula(Cu,Fe)₁₂Sb₄S₁₃
Mohs Hardness3
Crystal Systemcubic
Lustermetallic
Streak Colorblack to dark reddish brown
Cleavagenone
Fractureuneven
Specific Gravity4.8
Colorsdark grey, black
Transparencyopaque
Type LocalityBlack Pine mine, Granite County, Montana, USA
Mineral GroupSulfosalts
Usesore of copper, ore of antimony, collector
Associated Mineralsquartz, mimetite
Rarityuncommon
Description
A cluster of dark grey to black tetrahedrite crystals, some showing distinct faces, up to 2.2 cm in size, associated with clear to white quartz crystals.
Geological Context
Tetrahedrite typically forms in hydrothermal veins, often in low to medium temperature environments, and can be found in various ore deposits alongside other sulfide minerals.
