tetrahedrite Min.
(tɛtrəˈhiːdraɪt, -ˈhɛdraɪt)
[ad. Ger. tetraëdrit (W. Haidinger 1845), f. as prec. + -it, -ite1 2 b.]
Native sulphide of antimony and copper, with various elements sometimes replacing one or the other of these, often occurring in tetrahedral crystals; fahlerz, fahlore.
| 1868 Watts Dict. Chem. V. 729 Large tetrahedral crystals of tetrahedrite, having mostly a rough dull surface, are found in the Cornish mines near St. Austel. 1900 L. Fletcher in Brit. Mus. Return 156. |