Bournonite
Chemical Formula	PbCuSbS3
Species	Sulfides
Crystal System	Orthorhombic
Mohs Scale	2-3
Specific Gravity	5.7-5.9
Color	Steel-gray to iron-black
Streak	Steel-gray to iron-black
Luster	Metallic
Diaphaneity	Opaque
Cleavage	Imperfect/FairImperfect on , less perfect on
Fracture	Irregular/Uneven, Sub-Conchoidal
Crystal Habit：Crystals short prismatic to tabular, typically striated; commonly as subparallel aggregates. Also massive, granular to compact
Geological Setting：Moderate temperature hydrothermal veins.