Min. [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.
