mineral

Pyrite (likely)

Iron disulfide, FeS₂; commonly called fool’s gold

AI-generated identification · may be incorrect

Brassy yellow to grayish metallic luster, opaque, typically cubic or pyritohedral crystals; Mohs hardness 6–6.5, specific gravity about 5.0, with poor-to-indistinct cleavage. The specimen appears as a small irregular metallic sulfide fragment, though image quality limits certainty.

Identified August 19, 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 under reducing conditions. Pyrite ranges from modern to Precambrian in age and is widespread in Earth’s crust.

Uses & applications

Used historically as a sulfur source and occasionally for sulfuric-acid production; attractive crystals are collected and used decoratively, but it is not a valuable gold substitute.

Geological facts

Its metallic appearance can resemble gold, but pyrite is harder, more brittle, and usually paler or less malleable. It may oxidize in humid conditions, producing acidic alteration products.

Field identification & locations

Identify by its brassy color, metallic luster, brittle fracture, and inability to bend or flatten; a steel file generally scratches it, while gold does not. Common localities include Peru, Spain, Italy, China, and the United States.