mineral
Unidentified metallic mineral or metal-like specimen
Indeterminate from image; possibly galena (PbS) or a metallic sulfide
AI-generated identification · may be incorrectSmall gray-silver, strongly reflective piece with irregular/blocky surfaces; apparent metallic luster. Hardness, cleavage, crystal structure, and specific gravity cannot be reliably determined visually; galena would be Mohs 2.5–2.75 with cubic cleavage and high density (~7.5).
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Physical properties
Small gray-silver, strongly reflective piece with irregular/blocky surfaces; apparent metallic luster. Hardness, cleavage, crystal structure, and specific gravity cannot be reliably determined visually; galena would be Mohs 2.5–2.75 with cubic cleavage and high density (~7.5).
Formation & geological history
If galena, it formed in hydrothermal lead-zinc veins or replacement deposits, commonly with sphalerite, pyrite, and quartz; these deposits range from Paleozoic to recent geological ages.
Uses & applications
Galena is an important historical lead ore and source of silver; attractive crystals are collected, but lead-bearing specimens should be handled and stored safely. Value is typically modest unless well-formed or documented.
Geological facts
The image may also show a piece of metal, slag, or another non-geological material; photography alone cannot distinguish these confidently.
Field identification & locations
Test cautiously for very high density, metallic streak, cubic cleavage, and softness; avoid scratching household surfaces and wash hands after handling. Common galena localities include Missouri, Idaho, Australia, Peru, and Mexico.
