tetradymite

[te-trad-uh-mahyt]

noun

a mineral, bismuth telluride and sulfide, Bi2Te2S, occurring in soft-gray to black foliated masses.

Origin of tetradymite

1840–50; < Greek tetrádym(os) fourfold (see tetra-, didymous) + -ite¹; modeled on German Tetradymit

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Examples from the Web for tetradymite

Historical Examples of tetradymite

It is also found in some comparatively rare minerals, such as tetradymite, combined with tellurium, and associated with gold.
A Textbook of Assaying: For the Use of Those Connected with Mines.
Cornelius Beringer and John Jacob Beringer

British Dictionary definitions for tetradymite

tetradymite

noun

a grey metallic mineral consisting of a telluride and sulphide of bismuth. Formula: Bi 2 Te 2 S

Word Origin for tetradymite

C19: from Late Greek tetradumos fourfold, from Greek tetra- + didumos double

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