mineral
Likely galena-bearing sulfide specimen
Galena (PbS), possibly with pyrite or other sulfides
AI-generated identification · may be incorrectSmall dark gray, metallic-luster fragment with a bright silver-gray granular/crystalline surface. Galena has Mohs hardness 2.5–2.75, cubic crystals and perfect cubic cleavage; specific gravity is about 7.4–7.6. The image is insufficient for certain identification.
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Physical properties
Small dark gray, metallic-luster fragment with a bright silver-gray granular/crystalline surface. Galena has Mohs hardness 2.5–2.75, cubic crystals and perfect cubic cleavage; specific gravity is about 7.4–7.6. The image is insufficient for certain identification.
Formation & geological history
Forms in hydrothermal veins and replacement deposits, commonly with sphalerite, pyrite, quartz, and calcite. Most examples formed during various Phanerozoic ore-forming events rather than a single geological age.
Uses & applications
Historically the primary ore of lead, used in batteries, radiation shielding, ammunition, and specialized alloys; attractive crystals are collected. Avoid handling dust and never ingest or grind it because lead is toxic.
Geological facts
Galena’s unusually high density is often its most diagnostic feature. Its fresh fracture and cleavage surfaces are bright metallic gray, while weathering may produce white, yellow, or black oxidation coatings.
Field identification & locations
Common localities include Missouri and Illinois, USA; Peru, Mexico, Australia, and many European mining districts. Test cautiously for high heft and cubic cleavage; definitive identification requires streak, density, and ideally chemical testing.
