mineral
Likely galena-bearing sulfide fragment
Galena (PbS), possibly mixed with sphalerite and/or chalcopyrite
AI-generated identification · may be incorrectDark gray to black, strongly metallic luster, irregular to partly cubic-looking fracture, and likely Mohs hardness 2.5–3; galena is very dense (specific gravity about 7.5). The image is insufficient to confirm cleavage or exact mineral identity.
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Physical properties
Dark gray to black, strongly metallic luster, irregular to partly cubic-looking fracture, and likely Mohs hardness 2.5–3; galena is very dense (specific gravity about 7.5). The image is insufficient to confirm cleavage or exact mineral identity.
Formation & geological history
Galena forms in hydrothermal veins and carbonate-replacement deposits, commonly with sphalerite, pyrite, quartz, and calcite. Deposits range from Paleozoic to younger ages and occur worldwide.
Uses & applications
Historically the principal ore of lead, used in batteries, radiation shielding, solder, and ammunition; attractive crystals are collected, but lead-bearing specimens should not be used in jewelry or handled by children.
Geological facts
Galena commonly breaks along three excellent cleavage directions, producing shiny cubic fragments; freshly broken surfaces tarnish gray. It may contain silver, making some deposits economically important.
Field identification & locations
Look for exceptional heft, metallic gray color, cubic cleavage, and a dark streak; avoid scratching or grinding it because lead dust is hazardous. Common localities include Missouri, Illinois, Idaho, Peru, Mexico, Australia, and the United Kingdom.
