mineral
Galena (likely)
Galena, lead sulfide (PbS)
AI-generated identification · may be incorrectGray to lead-gray, metallic luster, commonly cubic cleavage, Mohs hardness 2.5–2.75, and very high specific gravity (~7.5). The rounded, flattened form appears polished or naturally worn, so crystal shape is obscured.
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Physical properties
Gray to lead-gray, metallic luster, commonly cubic cleavage, Mohs hardness 2.5–2.75, and very high specific gravity (~7.5). The rounded, flattened form appears polished or naturally worn, so crystal shape is obscured.
Formation & geological history
Forms mainly in hydrothermal sulfide veins and carbonate-replacement deposits, commonly with sphalerite, pyrite, and calcite. Galena occurs from many geologic ages, depending on the ore deposit.
Uses & applications
Historically the principal ore of lead, used in batteries, radiation shielding, ammunition, and some industrial alloys; attractive crystals are collector specimens. Handle carefully because lead-bearing dust is toxic.
Geological facts
Its unusually heavy feel and dark metallic-gray color are characteristic. It may contain silver, making some galena an important silver ore.
Field identification & locations
Common localities include Missouri and Idaho (USA), Mexico, Peru, Australia, and the United Kingdom. Confirm with heft, metallic streak, and cubic cleavage; avoid scratching or producing dust, and do not ingest or use for jewelry.
