mineral
Likely galena (lead ore)
Galena, PbS (identification from the image is tentative)
AI-generated identification · may be incorrectDark gray, metallic-looking, rough fragment with bright reflective flecks. Galena has Mohs hardness 2.5, cubic crystals, perfect cubic cleavage, and very high specific gravity (~7.4–7.6); weight and cleavage cannot be confirmed from the image.
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Physical properties
Dark gray, metallic-looking, rough fragment with bright reflective flecks. Galena has Mohs hardness 2.5, cubic crystals, perfect cubic cleavage, and very high specific gravity (~7.4–7.6); weight and cleavage cannot be confirmed from the image.
Formation & geological history
Forms in hydrothermal veins and sedimentary-hosted ore deposits, often with sphalerite and other sulfides. Its age depends on the deposit and cannot be determined visually.
Uses & applications
A major lead ore, historically used for lead production; specimens are also collected. Avoid handling dust or bringing it near food because lead is toxic.
Geological facts
Galena is exceptionally dense for its size and commonly breaks into shiny cubic fragments.
Field identification & locations
Check heft and look for smooth, right-angled cleavage faces; these traits distinguish it from many dark rocks. Found worldwide, including major deposits in the United States, Australia, and Europe.
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