The Probert Encyclopaedia of Rocks & Minerals

TETRAHEDRITE

Tetrahedrite (grey copper ore, fahlore, or panabase), so called because the crystals of the species are commonly tetrahedrons, is sulphide of antimony and copper, with small quantities of other metals. It is an ore of copper and silver. It is commonly found in hydrothermal veins formed at low to moderate temperatures and is usually associated with other silver, lead, and copper minerals. It has the formulae (Cu,Fe)12Sb4Si3 - (Cu,Fe) 12As4S13 and a relative hardness of 5.
Research Tetrahedrite