mineral
Galena-bearing ore
Galena (lead sulfide, PbS), likely with sphalerite and sulfide gangue
AI-generated identification · may be incorrectMetallic luster; dark gray to silver-black, commonly cubic crystals and granular masses. Galena has Mohs hardness 2.5–2.75, perfect cubic cleavage, and very high specific gravity (~7.4–7.6); the image’s reflective grains are consistent with sulfide minerals.
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Physical properties
Metallic luster; dark gray to silver-black, commonly cubic crystals and granular masses. Galena has Mohs hardness 2.5–2.75, perfect cubic cleavage, and very high specific gravity (~7.4–7.6); the image’s reflective grains are consistent with sulfide minerals.
Formation & geological history
Forms mainly in hydrothermal polymetallic veins, replacement bodies, and carbonate-hosted deposits, precipitating from hot, sulfur-rich fluids; deposits range from Precambrian to Cenozoic. Exact identification and age require testing and locality information.
Uses & applications
Historically the principal ore of lead, also commonly associated with silver; used in batteries, radiation shielding, ammunition, and specialized alloys. Specimens are collected for their metallic crystals, but lead-bearing material should be handled cautiously.
Geological facts
Fresh galena commonly shows sharp cubes and a bright lead-gray streak; tarnish may produce iridescent colors. It is much denser than ordinary dark rocks and can leave a dark gray streak on unglazed porcelain.
Field identification & locations
Common in the United States, Canada, Mexico, Peru, Australia, and Europe, especially in mining districts. Confirm with cubic cleavage, exceptional heft, streak, and professional mineralogical testing; avoid dust, ingestion, and prolonged handling.
