mineral

Tumbled metallic sulfide specimen, likely galena

Galena (lead sulfide, PbS), possibly mixed with pyrite or other sulfides

AI-generated identification · may be incorrect

Silver-gray, highly metallic luster, irregular tumbled form, and likely high specific gravity; galena has Mohs hardness 2.5–2.75 and cubic cleavage/crystals, though the specimen appears rounded and fractured.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Galena forms in hydrothermal veins and carbonate-replacement deposits, commonly with sphalerite, chalcopyrite, and pyrite. Its age depends on the deposit, ranging from Precambrian to Cenozoic.

Uses & applications

Collected as a mineral specimen and historically mined as the principal lead ore; associated silver can also be economically important. Lead-bearing material is not suitable for jewelry or casual handling.

Geological facts

The bright metallic appearance and unusually heavy look support galena, but the photograph cannot confirm identity; polished steel slag or another sulfide is possible.

Field identification & locations

Check whether it feels exceptionally heavy, leaves a gray-black streak, and shows cubic cleavage; avoid scratching or sanding it and wash hands after handling. Common localities include Missouri, Illinois, Idaho, Peru, Mexico, and Australia.