mineral

Galena-bearing sulfide ore

Galena (PbS), likely with sphalerite, pyrite, and/or iron-oxide matrix

AI-generated identification · may be incorrect

Metallic gray, coarse crystalline and locally cubic-looking, with bright reflective cleavage surfaces and earthy brown oxidation. Galena has Mohs hardness 2.5–2.75, perfect cubic cleavage, and very high specific gravity (~7.4–7.6); the specimen’s porous brown material suggests weathered host rock.

Identified August 27, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins and replacement deposits when lead-bearing fluids precipitated sulfide minerals, commonly alongside sphalerite and pyrite. The visible brown zones are oxidation products formed near the surface; exact geological age and locality require testing or provenance.

Uses & applications

Galena is the principal lead ore, historically used in batteries, radiation shielding, ammunition, and lead production; attractive crystals are collected. It is generally unsuitable for jewelry because it is soft, brittle, and toxic if dust is inhaled or material is ingested.

Geological facts

Its unusually high density is a strong diagnostic clue, and fresh galena commonly breaks along mirror-bright cubic planes. Lead sulfide may tarnish and weather to anglesite, cerussite, or iron-rich coatings.

Field identification & locations

Look for heft, metallic luster, gray streak, and cubic cleavage; a streak test and density comparison help distinguish it from graphite or hematite. Common in Missouri, Illinois, the Tri-State district, Peru, Mexico, Australia, and Germany; avoid sanding or licking it.