Galena

Chemical name |  Lead sulfide
Chemical formula |  PbS
Identification
Colors |  Dark lead-gray; metallic when fresh
Crystal habit |  Commonly in cubes and octahedrons; dodecahedrons less frequent; also massive and in cleavage fragments, coarse\- or fine-grained, fibrous
Crystal system |  Isometric
Cleavage |  Cubic cleavage
Fracture |  Subconchoidal, (rare); brittle
Hardness |  2.5
Name origin |  From the Latin galena, which was applied to lead ore or the dross from melted lead.
Specific gravity |  7.4 to 7.6
Streak |  Dark lead-gray

Galena is a mineral whose main component is lead sulfide. It is an important ore of lead. Some samples also contain silver.[1]

## Sources[edit]

1. ↑ http://geology.com/minerals/galena.shtml

## Further reading[edit]

* Chesterman, Charles W. pp. 361–362 The Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf: New York (1987)