Bismuthinite Composition, Crystallization, Structure and Occurrence

Composition. Bismuth trisulphide, Bi2S3 = Sulfur 18.8, bismuth 81.2.

Crystallization. Orthorhombic. In acicular crystals.

Structure. Usually massive, foliated or bladed.

Physical Properties. Perfect cleavage parallel to brachypinacoid. H. = 2. G. = 6.4-6.5. Metallic luster. Color and streak lead-gray.

Test. Easily fusible (1). Roasted in O.T. or B.B. on charcoal gives odor of sulfur dioxide. Mixed with potassium iodide and sulfur and heated on charcoal gives  characteristic yellow to red coating and treated similarly on a plaster tablet gives a chocolate – brown coating underlain by red. Resembles stibnite; recognized by the test or bismuth.

Occurrence. A rare mineral occurring commonly I n veins that show definite relations to igneous rocks. Found in Cornwall and Cumberland, England; in Saxony, Sweeden. Important deposits associated with tin and tugsten ores occur in Bolivia. From Beaver Country in Utah, etc.

Use. An are of bismuth. See under native bismuth.

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