mineral
Likely galena-bearing ore
Galena (PbS), possibly mixed with quartz and sulfide minerals
AI-generated identification · may be incorrectCoarse metallic gray, strongly reflective fragments with uneven fracture; galena has Mohs hardness 2.5–2.75, cubic cleavage, metallic luster, and high specific gravity (~7.5). The pictured pieces may also contain pyrite or other sulfides, so exact identification requires testing.
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Physical properties
Coarse metallic gray, strongly reflective fragments with uneven fracture; galena has Mohs hardness 2.5–2.75, cubic cleavage, metallic luster, and high specific gravity (~7.5). The pictured pieces may also contain pyrite or other sulfides, so exact identification requires testing.
Formation & geological history
Forms in hydrothermal veins and replacement deposits, commonly with sphalerite, pyrite, chalcopyrite, and quartz; deposits range from Paleozoic to younger geological ages.
Uses & applications
Historically the primary lead ore, used for batteries, radiation shielding, weights, and lead compounds; attractive crystals are collected, though lead-bearing material should not be handled casually or used in jewelry.
Geological facts
Galena’s cubic cleavage and unusually heavy feel are diagnostic; powdered or weathered specimens can expose toxic lead compounds.
Field identification & locations
Look for bright lead-gray metallic color, cubic cleavage, and exceptional density; streak is lead-gray. Common localities include Missouri, Colorado, Idaho, Peru, Mexico, Australia, and Europe.
