Image: <bdi><a href="https://www.wikidata.org/wiki/Q126871368" class="extiw" title="d:Q126871368"><span title="photographer from the United States">Darla Sondrol</span></a></bdi> (CC0)
monoclinicuncommonsulfides
Boulangerite
Pb5Sb4S11
This specimen of boulangerite is characterized by its fine, dense, hair-like or fibrous crystals, exhibiting a dark lead-gray to blackish color.
Boulangerite Physical Properties
Mohs Hardness
2.5Crystal System
monoclinicLuster
metallicStreak Color
blackish-grayCleavage
good on {100}Fracture
unevenSpecific Gravity
6.25Colors
lead-gray, steel-gray, dark gray, blackishTransparency
opaqueType Locality
MexicoMineral Group
sulfidesUses
minor ore of lead, minor ore of antimony, collectorAssociated Minerals
galena, sphalerite, pyrite, arsenopyrite, tetrahedrite, stibnite, quartz, sideriteRarity
uncommonGeological Context
Boulangerite typically forms in low-to-medium temperature hydrothermal veins, often found in association with other lead-antimony sulfosalts and sulfide minerals.
