mineral
Likely galena-bearing ore
Galena (PbS), possibly mixed with quartz or carbonate gangue
AI-generated identification · may be incorrectSmall, irregular gray metallic specimen with a bright lead-gray luster and granular/crystalline texture. Galena has Mohs hardness 2.5–3, cubic cleavage, and very high specific gravity (~7.5); the image is insufficient to confirm cleavage or composition.
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Physical properties
Small, irregular gray metallic specimen with a bright lead-gray luster and granular/crystalline texture. Galena has Mohs hardness 2.5–3, cubic cleavage, and very high specific gravity (~7.5); the image is insufficient to confirm cleavage or composition.
Formation & geological history
Forms mainly in hydrothermal veins and replacement deposits, commonly with sphalerite, chalcopyrite, quartz, and calcite. Deposits occur in many geological ages, including Paleozoic Mississippi Valley-type ores and younger vein systems.
Uses & applications
Historically the principal lead ore, used for batteries, radiation shielding, ammunition, and alloys; specimens are collected for metallic luster and cubic crystals. Handle carefully because lead-bearing material and dust are toxic.
Geological facts
Galena is unusually dense and often leaves a dark gray streak; fresh surfaces may tarnish. It is commonly associated with silver, making some galena ores economically valuable.
Field identification & locations
Test density, streak, and cubic cleavage; avoid scratching or grinding it, and wash hands after handling. Common localities include Missouri, Illinois, Colorado, Peru, Australia, and Mexico.
