foliated tellurium

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• Nagyagite — Nag yag*ite, n. [So called from Nagyag, in Transylvania.] (Min.) A mineral of blackish lead gray color and metallic luster, generally of a foliated massive structure; foliated tellurium. It is a telluride of lead and gold. [1913 Webster] …   The Collaborative International Dictionary of English

• Tetradymite — is a mineral consisting of bismuth, tellurium and sulfide, Bi2Te2S, also known as telluric bismuth. If sulfur is absent the mineral is tellurobismuthite and the formula is then Bi2Te3. Traces of selenium are usually present.Crystals are… …   Wikipedia

• Melonite — For the trademarked surface finish, see Ferritic nitrocarburizing. Melonite Melonite after calaverite, on quartz. Cresson mine, Cripple Creek, Colorado. Size: 1.3 x 0.9 x 0.4 cm …   Wikipedia

• tetradymite — /te trad euh muyt /, n. a mineral, bismuth telluride and sulfide, Bi2Te2S, occurring in soft gray to black foliated masses. [1840 50; < Gk tetrádym(os) fourfold (see TETRA , DIDYMOUS) + ITE1; modeled on G Tetradymit] * * * ▪ mineral       a… …   Universalium