mineral

Pyrite-bearing sulfide specimen (likely pyrite)

Pyrite, FeS₂; possibly mixed with pyrrhotite or chalcopyrite

AI-generated identification · may be incorrect

Brassy metallic luster with granular, irregular crystal surfaces; pyrite hardness 6–6.5 Mohs, opaque, cubic crystal system, and no prominent cleavage. The image is insufficient to confirm exact mineral or specific gravity.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins, sedimentary rocks, and metamorphic environments when iron and sulfur combine, commonly from Paleozoic to modern geological settings. The specimen may be a weathered, naturally fractured sulfide nodule.

Uses & applications

Collected as a mineral specimen and formerly used as a sulfur and iron ore; generally not used for jewelry because it can tarnish and oxidize. Common pieces are inexpensive unless crystals are exceptionally sharp or aesthetically arranged.

Geological facts

Pyrite is called “fool’s gold,” but it is harder, more brittle, and usually paler than gold. It may produce a sulfurous odor when struck or powdered, and oxidation can create acidic drainage.

Field identification & locations

Look for a brass-yellow metallic color, high density, blackish streak, and cubic or pyritohedral crystals; gold leaves a yellow streak and is malleable. Common localities include Spain, Peru, Italy, China, and the United States.