tetradymite


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te·trad·y·mite

 (tĕ-trăd′ə-mīt′)
n.
A steel-gray mineral, chiefly Bi2Te2S.

[German Tetradymit, from Late Greek tetradumos, fourfold (from the double twin crystals in which it usually is found) : Greek tetra-, tetra- + didumos, double; see dwo- in Indo-European roots.]

tetradymite

(tɛˈtrædɪˌmaɪt)
n
(Minerals) a grey metallic mineral consisting of a telluride and sulphide of bismuth. Formula: Bi2Te2S
[C19: from Late Greek tetradumos fourfold, from Greek tetra- + didumos double]
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