mineral
Likely galena (lead sulfide)
Galena, PbS
AI-generated identification · may be incorrectMetallic gray, with blocky cleavage surfaces; galena has cubic crystals, Mohs hardness 2.5, and unusually high specific gravity (~7.5). The photo’s dull, rough surfaces make identification uncertain without a weight or streak test.
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Physical properties
Metallic gray, with blocky cleavage surfaces; galena has cubic crystals, Mohs hardness 2.5, and unusually high specific gravity (~7.5). The photo’s dull, rough surfaces make identification uncertain without a weight or streak test.
Formation & geological history
Forms in hydrothermal veins and some sedimentary deposits, commonly alongside sphalerite, quartz, or calcite; deposits range widely in age.
Uses & applications
The principal ore of lead, historically used in lead-acid batteries, shielding, and other lead products; attractive crystals are collected, though lead toxicity limits handling.
Geological facts
Galena’s cubic cleavage is distinctive, and a fresh streak is lead-gray. Avoid grinding or prolonged handling, and wash hands afterward.
Field identification & locations
Compare the specimen’s heft with its size and test a small fresh surface for a gray streak; these help distinguish galena from similar-looking metallic minerals. Found in lead-zinc districts worldwide, including the United States, Australia, and Europe.
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