mineral

Likely metallic sulfide mineral fragment

Possibly galena (PbS) or pyrite (FeS₂); identification is uncertain from the photograph

AI-generated identification · may be incorrect

Small dark gray, metallic-luster fragment with irregular fracture and apparent granular/crystalline texture. Galena has Mohs hardness 2.5, cubic cleavage, and high density; pyrite is harder (6–6.5) and commonly brassy yellow, though tarnished pieces can appear gray.

Identified August 7, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed in hydrothermal mineral veins or sulfide-rich ore deposits; age depends on its host deposit, ranging from Precambrian to modern geological settings.

Uses & applications

Galena is an important historical lead ore and sometimes yields silver; pyrite is collected and used as an educational or ornamental mineral, but neither is generally used as jewelry in rough form.

Geological facts

The specimen is too small and blurry for confident identification; metallic luster and density are important clues. Avoid filing, crushing, or ingesting it because galena may contain toxic lead.

Field identification & locations

Check streak: galena gives a dark gray streak and is very heavy, while pyrite gives a greenish-black streak and resists scratching with steel. Common sources include Missouri, Illinois, Peru, Spain, and hydrothermal mining districts worldwide.