Images
Formula: Pb5Sb4S11
Sulphosalt
Crystal System: Monoclinic
Specific gravity: 6.2 measured, 6.21 calculated
Hardness: 2½ to 3
Streak: Brown to brown-grey
Colour: Lead-grey
Common impurities: Cu,Zn,Sn,Fe
Environments:
Boulangerite occurs in low to moderate temperature hydrothermal veins (Webmin), associated with lead sulphosalts,
galena, stibnite,
sphalerite, pyrite,
arsenopyrite, siderite
and quartz
(HOM)
Localities
The Bairendaba Ag-polymetallic deposit, Hexigten Banner, Chifeng City, Inner Mongolia, China, is a mesothermal
magmatic-hydrothermal vein-type silver -
lead - zinc deposit, hosted in
Hercynian (about 419 to 299 million years ago) quartz
diorite.
It is suggested that, with decreasing temperature, mineral compositions changed progressively from
tungstate and oxide, to diatomic sulphide, to simple sulphide, to an
antimony sulphosalt mineral, and finally to an
antimonide.
Boulangerite occurs as free-growing acicular crystals and as inclusions associated with
fluorite, quartz and
calcite
(Minrec 53.347-359).
Back to Minerals