Definition of tetradymite
: a mineral Bi2Te2S consisting of a telluride and sulfide of bismuth, sometimes containing selenium, being pale steel gray in color and of a metallic luster, and occurring usually in foliated masses (hardness 1.5–2, specific gravity 7.2–7.6)
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Origin and Etymology of tetradymite
Late Greek tetradymos fourfold, from Greek tetra- + didymos twin; from its occurrence in compound twin crystals — more at -dymus
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