Boulangerite

minerals

stibnite

arsenopyrite

sphalerite

Formula: Pb5Sb4S11
Sulphosalt
Specific gravity: 6.0 to 6.3
Hardness: 2½ to 3
Streak: Brown to brown-grey
Colour: Lead-grey
Common impurities: Cu,Zn,Sn,Fe
Environments:

Hydrothermal environments

Boulangerite occurs in low to moderate temperature hydrothermal veins (Webmin), associated with lead sulphosalts, galena, stibnite, sphalerite, pyrite, arsenopyrite, siderite and quartz (HOM)

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