a steel-gray or blackish mineral with a brilliant metallic luster, essentially copper and antimony sulfide, (Cu, Fe, Zn, Ag,)12 Sb4S13, an end member of a series of solid solutions into which arsenic enters to form tennantite: mined as an ore of copper and silver.
Origin of tetrahedrite
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Tetrahedrite, blende, diamond, boracite and pharmacosiderite are substances which crystallize in this class.
In external form these crystals are cubic with inclined hemihedrism, the symmetry being the same as in blende and tetrahedrite.
a grey metallic mineral consisting of a sulphide of copper, iron, and antimony, often in the form of tetrahedral crystals: it is a source of copper. Formula: (Cu,Fe) 12 Sb 4 S 13
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