mineral
Galena-bearing sulfide fragment
Galena (PbS), possibly with quartz or carbonate gangue
AI-generated identification · may be incorrectDark gray to lead-gray, metallic to submetallic luster with pale gray/white crust or matrix; galena is cubic, has perfect cubic cleavage, Mohs hardness 2.5–2.75, and specific gravity about 7.4–7.6. The rounded, weathered form prevents confident visual confirmation.
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Physical properties
Dark gray to lead-gray, metallic to submetallic luster with pale gray/white crust or matrix; galena is cubic, has perfect cubic cleavage, Mohs hardness 2.5–2.75, and specific gravity about 7.4–7.6. The rounded, weathered form prevents confident visual confirmation.
Formation & geological history
Galena forms in hydrothermal sulfide veins and replacement deposits, commonly with sphalerite, chalcopyrite, pyrite, quartz, and calcite. Deposits range from Precambrian to Cenozoic in age; the white material may represent oxidation products or gangue.
Uses & applications
Historically an important lead ore used in batteries, radiation shielding, ammunition, pigments, and alloys; attractive crystals are collected, but lead-bearing specimens should not be handled by children or used in jewelry.
Geological facts
Fresh galena typically shows bright metallic luster and sharply cubic cleavage; weathering can produce white-to-gray lead carbonates and sulfates. It is toxic if dust or residue is ingested.
Field identification & locations
Test cautiously for unusually high heft and cubic cleavage; avoid scratching or grinding, and wash hands after handling. Common in Missouri, Illinois, Idaho, Mexico, Peru, Australia, and many hydrothermal mining districts.
