Min. [a. Ger. tetradymit (W. Haidinger, 1831), f. Gr. τετράδυμ-ος fourfold + -ITE1.] Telluride of bismuth, found in pale steel-grey laminæ with a bright metallic luster.
(The name has also been applied to WEHRLITE.)
1850. Ansted, Elem. Geol., § 491. Tetradymite, Tellurium, and bismuth.
1859. Page, Handbk. Geol. Terms (1865), Tetradymite..., sulphotelluride of bismuth … from the quadruple macles in which its crystals usually appear.
1874. Proc. Amer. Phil. Soc., XIV. 224. The sulphurous variety of tetradymite has been observed at several new localities.
