mineral
Likely raw galena fragment
Galena (lead sulfide, PbS), possibly with metallic sulfide matrix
AI-generated identification · may be incorrectSmall dark gray-brown, metallic-looking fragment with irregular faces; galena is Mohs 2.5–2.75, silver-gray, very dense (specific gravity ~7.5), cubic crystal structure, and perfect cubic cleavage. The image is too small and indistinct for definitive identification.
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Physical properties
Small dark gray-brown, metallic-looking fragment with irregular faces; galena is Mohs 2.5–2.75, silver-gray, very dense (specific gravity ~7.5), cubic crystal structure, and perfect cubic cleavage. The image is too small and indistinct for definitive identification.
Formation & geological history
Galena forms mainly in hydrothermal veins and carbonate-hosted replacement deposits, commonly with sphalerite, pyrite, and quartz; deposits range from ancient Precambrian to younger Phanerozoic ages.
Uses & applications
Historically the principal ore of lead, used in batteries, radiation shielding, ammunition, and alloys; attractive crystals are collected, but it is not generally used as jewelry because lead sulfide is toxic.
Geological facts
Its unusually high density and bright metallic luster are diagnostic; freshly broken galena typically reveals shiny cubic cleavage surfaces. Avoid ingestion, dust, and prolonged handling, and wash hands afterward.
Field identification & locations
Common localities include Missouri and Illinois, USA; Mexico; Peru; Australia; and Europe. Confirm with density, metallic luster, and cubic cleavage, while distinguishing it from darker, less dense graphite or non-cleaving sulfides.
