Ism é“‹ Mine (Bismuthinite)

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Bi 2 S 3

[Chemical composition] The same type of the same type of mixed substances mainly include Pb, Cu, Sb and Se.

[Crystal structure] orthorhombic system; a 0 =1.113 nm, b 0 =1.127 nm, c 0 =0.397 nm; Z=4. Structure Bismuthinite and stibnite and so on.

[Form] The crystal form is often long column-shaped to needle-like, and the crystal faces are mostly longitudinal, and the aggregates are dense in shape (Fig. L-15).

Figure L-15 stibnite aggregate

[Physical properties] microstrip lead white gray tin; mottled yellow or surfaces of constant current Qiang color; gray streak lead; metallic luster; opaque. Cleavage parallel {010} complete. Hardness 2 to 2.5. The relative density is 6.8.

[genesis and occurrence] are mainly found in tungsten-tin high-temperature hydrothermal deposits and contact metasomaties.

[Identification characteristics] Similar to stibnite, the color is lighter than that of stibnite, the gloss is strong, the relative density is large, there is no horizontal grain on the cleavage surface, and it does not react with KOH solution.

[Main use] is an important ore mineral of bismuth.

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