mineral
Galena-bearing rock
Galena (PbS), likely with quartz or host-rock minerals
AI-generated identification · may be incorrectDark gray to silver metallic luster, irregular/fractured surfaces, and very high density; galena has Mohs hardness 2.5–2.75, cubic crystals, and perfect cubic cleavage. The specimen appears partly weathered and matrix-bound rather than a clean crystal.
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Physical properties
Dark gray to silver metallic luster, irregular/fractured surfaces, and very high density; galena has Mohs hardness 2.5–2.75, cubic crystals, and perfect cubic cleavage. The specimen appears partly weathered and matrix-bound rather than a clean crystal.
Formation & geological history
Galena forms mainly in hydrothermal lead-zinc veins, commonly with sphalerite, pyrite, calcite, and quartz. Deposits range from Precambrian to younger Phanerozoic ages; age cannot be determined from the image.
Uses & applications
Historically the principal ore of lead, used in batteries, radiation shielding, ammunition, and alloys; attractive crystals are collected, though lead-bearing material is not suitable for jewelry or food-contact use.
Geological facts
Fresh galena is bright metallic silver-gray but may tarnish to dull gray or black. It is unusually heavy for its size and can leave a dark gray streak.
Field identification & locations
Identify by heft, metallic appearance, cubic cleavage, and dark gray streak; confirm with density or laboratory testing because similar sulfides occur in the same settings. Common localities include Missouri, Illinois, Idaho, Peru, Mexico, Australia, and China.
