mineral

Pyrite (likely)

Pyrite, FeS₂ (iron disulfide)

AI-generated identification · may be incorrect

Brassy yellow to coppery metallic luster, granular/crystalline texture, and commonly cubic or pyritohedral crystals; Mohs hardness 6–6.5, specific gravity about 5.0. The warm pink lighting may exaggerate its copper tone; crystal faces are not sufficiently clear for certainty.

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins and sedimentary rocks, especially limestone, shale, and coal; deposits range from ancient Precambrian to modern geological settings. It crystallizes when sulfur-bearing fluids react with iron.

Uses & applications

Used historically as a sulfur and iron source and occasionally for sulfuric-acid production; today it is mainly a decorative or teaching specimen. Attractive crystals have modest collector value.

Geological facts

Its metallic appearance earned the nickname “fool’s gold,” but pyrite is harder and more brittle than gold and often forms sharp cubic crystals. Weathering can produce sulfuric acid and rusty iron oxides.

Field identification & locations

Check for a brass-yellow color, metallic luster, high density, and brittle fracture; pyrite may leave a dark greenish-black streak, unlike gold’s yellow streak. Common localities include Spain, Peru, Italy, China, and the United States.