Tetradymite

（重定向自Telluric Bismuth）

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 rhombohedral, but are rarely distinctly developed; they are twinned together in groups of four; hence the name of the mineral, from the Greek for fourfold. There is a perfect cleavage parallel to the basal plane and the mineral usually occurs in foliated masses of irregular outline. The color is steel-gray, and the luster metallic and brilliant. The mineral is very soft (H = 1.5 - 2) and marks paper. The specific gravity is 7.2 to 7.9.

单词	Telluric Bismuth
释义	Telluric Bismuth 英语百科 Tetradymite （重定向自Telluric Bismuth） 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 rhombohedral, but are rarely distinctly developed; they are twinned together in groups of four; hence the name of the mineral, from the Greek for fourfold. There is a perfect cleavage parallel to the basal plane and the mineral usually occurs in foliated masses of irregular outline. The color is steel-gray, and the luster metallic and brilliant. The mineral is very soft (H = 1.5 - 2) and marks paper. The specific gravity is 7.2 to 7.9.
随便看	mesopristes argenteus的意思 mesopristes cancellatus的意思 mesoprosopic的意思 mesoprosopic skull的意思 mesoprosopy的意思 Mesoproterozoic的意思 Mesoproterozoic Era的意思 Mesoproterozoic Erathem的意思 mesopsammic的意思 mesopsammon的意思 mesopsocus hongkongensis的意思 mesopsyche的意思 mesopsychic的意思 mesopterygial cartilage的意思 mesopterygium的意思 mesopterygoid的意思 mesopterygoid bone的意思 mesoptic vision的意思 mesoptile的意思 mesoptyelus arisanus的意思 mesoptyelus auropilosus的意思 mesoptyelus fascialis的意思 mesoptyelus karenkonis的意思 mesopulmonum的意思 mesopuncture的意思