mineral
Dark metallic sulfide specimen, possibly galena
Galena (lead sulfide, PbS), identification tentative
AI-generated identification · may be incorrectAppears dark gray to black with bright metallic patches and irregular fracture; galena is Mohs 2.5, cubic crystal structure, perfect cubic cleavage, and very high specific gravity (~7.5). The photo alone cannot confirm cleavage or density.
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Physical properties
Appears dark gray to black with bright metallic patches and irregular fracture; galena is Mohs 2.5, cubic crystal structure, perfect cubic cleavage, and very high specific gravity (~7.5). The photo alone cannot confirm cleavage or density.
Formation & geological history
Galena forms mainly in hydrothermal veins and carbonate-replacement deposits, commonly with sphalerite, pyrite, and quartz; deposits range from Precambrian to younger Phanerozoic ages.
Uses & applications
An important historical ore of lead and commonly associated with silver; attractive crystals are collected, but specimens should not be handled extensively because lead-bearing dust and residue are hazardous.
Geological facts
Galena typically breaks into shiny cubic fragments and is much heavier than an ordinary dark stone. The specimen could also be another sulfide mineral, slag, or a metal-rich rock.
Field identification & locations
Check for unusually high weight, metallic gray streak, and cubic cleavage; avoid scratching or making dust, and wash hands afterward. Common localities include the United States, Mexico, Peru, Australia, and Europe.
