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 incorrectDark 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.
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Physical properties
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.
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.
