Mineral description : Bournonite

Mineral class Sulphides : Tetrahedrite bournonite boulangerite group
Chemical formula PbCuSbS3
Crystal system Orthorombic
Habitus Crystals are tabular and prismatic, often striated creating a cogwheel shape. Commonly in granular aggregates or massive.
Cleavage Poor, fracture subconchoidal.
Hardness 2.5 - 3
Density 5.8 - 5.84
Color Silvery gray to black, opaque.
Streak Black.
Luster Metallic.
Description A minor ore of lead, mostly used for mineral specimens.
Associates Siderite, galena, fluorite, sphalerite, pyrite and calcite.
Notes Type locality : Wheal Boys, St. Endellion, Cornwall, England.
Bournonite often develops a grayish tarnish.
Locations A common mineral worldwide but with few localities in Sweden.
  • Långdalsgruvan, Boliden, Västerbotten, Sweden.
  • Boliden, Västerbotten, Sweden.
  • Långsele, Västerbotten, Sweden.

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Last changed : 2000-06-10