mineral

Likely galena-bearing ore

Galena (lead sulfide, PbS), possibly mixed with quartz or other sulfides

AI-generated identification · may be incorrect

Gray to silvery-gray, metallic luster, irregular/fractured surface; galena has Mohs hardness 2.5–2.75, cubic crystals and perfect cubic cleavage, with very high specific gravity (~7.5). The image is insufficient to confirm crystal form or composition.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Galena forms in hydrothermal veins and replacement deposits, commonly with quartz, sphalerite, and pyrite, from low- to moderate-temperature mineralizing fluids. Its age depends on the host deposit and cannot be determined visually.

Uses & applications

A major historical ore of lead and an important source of silver; specimens are collected for their metallic appearance and cubic crystals. Lead-bearing material is hazardous and should not be handled, cut, or heated unnecessarily.

Geological facts

Fresh galena is exceptionally dense and often leaves a dark gray streak; tarnished surfaces may appear dull or whitish. The specimen could also be another metallic sulfide or industrial slag, so testing is needed for certainty.

Field identification & locations

Check for unusually high density, cubic cleavage, and a dark gray streak on unglazed porcelain; do not taste or scratch with bare hands. Common localities include Missouri, Illinois, Idaho, Mexico, Peru, Australia, and Europe.