Stibnite

sulfide

galena

Formula: Sb2S3 sulphide
Specific gravity: 4.6 to 4.7
Hardness: 2
Streak: Dark grey
Colour: Lead-grey
Solubility: Moderately soluble in hydrochloric acid; slightly soluble in nitric acid
Melting point: 546oC
Environments:

Hot spring deposits
Hydrothermal environments common

Stibnite is found in epithermal (low temperature) hydrothermal veins, particularly in stibnite- quartz veins, in replacement deposits and in hot spring deposits. It is associated with other antimony minerals that have formed as the product of its decomposition, and with galena, cinnabar, sphalerite, baryte, realgar, orpiment and gold.

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