mineral

Probable galena

Galena (lead sulfide, PbS)

AI-generated identification · may be incorrect

The specimen appears dark gray to silver with a metallic luster and blocky, stepped cleavage surfaces, consistent with galena. Hardness is about 2.5–2.75 Mohs; it is very dense (specific gravity about 7.4–7.6) and commonly forms cubic crystals or massive fragments.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

Galena forms mainly in hydrothermal veins and carbonate-replacement deposits, often with sphalerite, pyrite, and quartz. Most specimens formed during various hydrothermal episodes from the Precambrian through the Cenozoic; the image alone cannot establish age.

Uses & applications

Historically the principal ore of lead, used in batteries, radiation shielding, ammunition, and industrial alloys; attractive crystals are collected. It is generally unsuitable for jewelry because it is soft, brittle, and toxic if dust or particles are ingested.

Geological facts

Its excellent cubic cleavage is a diagnostic feature, and freshly broken surfaces are bright metallic silver but may tarnish gray. Lead-bearing specimens should be handled with care and kept away from children, food, and pets.

Field identification & locations

Common localities include Missouri and Illinois, USA; Mexico; Peru; Australia; Germany; and the United Kingdom. Confirm with unusually high heft, cubic cleavage, and a streak test (dark gray), but avoid grinding or inhaling dust; visual identification is provisional.