mineral
Raw metallic sulfide specimen, likely galena
Galena (lead sulfide, PbS), possibly mixed with sphalerite or chalcopyrite
AI-generated identification · may be incorrectDark gray to black, very high metallic luster, opaque, and commonly crystalline with cubic cleavage; Mohs hardness 2.5–2.75 and specific gravity about 7.4–7.6. The specimen’s irregular form and reflective surfaces are consistent with galena, though the image alone cannot confirm it.
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Physical properties
Dark gray to black, very high metallic luster, opaque, and commonly crystalline with cubic cleavage; Mohs hardness 2.5–2.75 and specific gravity about 7.4–7.6. The specimen’s irregular form and reflective surfaces are consistent with galena, though the image alone cannot confirm it.
Formation & geological history
Forms in hydrothermal veins and replacement deposits, often with sphalerite, pyrite, and quartz; many deposits formed during the Paleozoic to Mesozoic eras. Common localities include Missouri and Illinois, the Tri-State district, Colorado, Peru, Mexico, and Australia.
Uses & applications
Primary ore of lead and an important historical source of silver; chiefly used in batteries, radiation shielding, alloys, and specialized industrial applications. Attractive crystals are collected but are not generally used as gemstones.
Geological facts
Galena is exceptionally dense for its size and commonly breaks along smooth cubic planes. Handle carefully: lead-bearing material should not be inhaled, licked, or used near food, and hands should be washed after handling.
Field identification & locations
Check for unusual heft, metallic gray color, cubic cleavage, and a gray-black streak; a streak test and specific-gravity measurement help distinguish it from magnetite or graphite. Avoid filing or crushing it because of lead dust.
