mineral

Metallic sulfide-bearing rock, likely galena-rich ore

Galena (lead sulfide, PbS), possibly mixed with pyrite/chalcopyrite and host rock

AI-generated identification · may be incorrect

Dark gray to silver metallic luster with irregular granular texture; galena has Mohs hardness 2.5–2.75, cubic cleavage, and very high specific gravity (~7.5). The specimen appears weathered and matrix-bearing, so hardness and density may vary.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed in hydrothermal veins or replacement deposits when metal-rich fluids precipitated sulfide minerals in fractures, commonly during the Paleozoic–Mesozoic or younger mineralizing events.

Uses & applications

Galena is the principal lead ore and historically supplied silver; specimens are collected for their metallic appearance. Lead-bearing material should not be used for jewelry, handled excessively, or tested by scratching indoors.

Geological facts

Fresh galena breaks into bright cubic faces and is much heavier than an ordinary stone of the same size; oxidation may produce dull gray, white, brown, or green secondary minerals.

Field identification & locations

Identify by unusually high weight, metallic gray color, and cubic cleavage; a streak test may be dark gray, but avoid powder exposure. Common localities include Missouri and Colorado, USA, and mining districts worldwide.