tetrahedrite
nounA grayish-black mineral, essentially (CuFe)12Sb4S13, often containing other elements, and used as an ore of copper.
A mineral often occurring in tetrahedral crystals (whence the name), also massive, of an iron-black color and brilliant metallic luster.
A sulphide of antimony and copper, with small quantities of other metals. It is a very common ore of copper, and some varieties yield a considerable presentage of silver. Called also gray copper ore, fahlore, and panabase.
A complex ore of copper, a mixed sulfide of copper, iron, zinc, silver and antimony.
