Tetrahedrite, (Cu,Fe)12Sb4S13, optical properties using a reflected-light polarizing microscope (adapted from Spry & Gedlinske, 1987):
System: Cubic
Reflectance: Medium
Colour: Greyish white to greenish grey-white
VHN and polishing hardness: 285 - 354 / medium
Pleochroism: Nonpleochroic
Anisotropism: Isotropic
Internal reflections: Rare, brownish red
Twinning: Not present
Commonly associated minerals: Ag minerals, bornite, bournonite, brannerite, calaverite, chalcopyrite, Co-Ni minerals, covellite, delafossite, digenite, enargite, famatinite, luzonite, mawsonite
Sample from the EOSC424 reflected light sample collection at UBC
