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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References in periodicals archive ?
Devouard performed EDX-analyses of a few of these associated minerals and found significant amounts of tellurium; this possibly is attributable to primary bismuth tellurides such as tetradymite or tsumoite having once been present in this gold-rich ore.
Tetradymite was described by Turneaure (1935) as inclusions in bismuthinite from the Contacto vein, Level 446.
07]* Relationship to other species: It is related to the members of the tetradymite group.