mineral
Galena
Lead Sulfide (PbS)
Hardness: 2.5 on the Mohs scale, Color: Lead-gray, Luster: Metallic to sub-metallic, Crystal Structure: Cubic, Cleavage: Perfect in three directions at 90 degrees (cubic cleavage), Specific Gravity: 7.4 - 7.6 (very heavy for its size)
- Hardness
- 2
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Physical properties
Hardness: 2.5 on the Mohs scale, Color: Lead-gray, Luster: Metallic to sub-metallic, Crystal Structure: Cubic, Cleavage: Perfect in three directions at 90 degrees (cubic cleavage), Specific Gravity: 7.4 - 7.6 (very heavy for its size)
Formation & geological history
Forms in hydrothermal veins associated with limestone and other sedimentary rocks, as well as in metamorphic and igneous environments.
Uses & applications
Primary ore of lead, historically used in glazes, batteries, and ammunition.
Geological facts
Galena is a classic example of a sulfide mineral and was one of the first minerals used for crystal radios as a semiconductor.
Field identification & locations
Easily identified by its high specific gravity, cubic cleavage, bright metallic luster, and dark gray streak. Found worldwide, notably in Missouri, USA, and various locations in Europe and Mexico.
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