mineral

Pyrite-bearing rock (likely pyrite-rich quartz or schist)

Pyrite, FeS₂, intergrown with quartz and/or mica-rich matrix

AI-generated identification · may be incorrect

Brassy yellow metallic luster, opaque, granular to crystalline texture, and irregular fracture; pyrite hardness is 6–6.5 Mohs, with specific gravity about 5.0. The specimen appears massive and weathered rather than showing diagnostic cubic crystals.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Pyrite forms in hydrothermal veins and sedimentary or metamorphic environments when sulfur-bearing fluids react with iron; associated rocks may range from Precambrian to recent geological ages. Exact age and host rock cannot be determined from the photograph.

Uses & applications

Used historically as a sulfur source and occasionally in jewelry, display specimens, and educational collections; it has little construction value. Attractive crystalline pieces may be collectible.

Geological facts

Its metallic gold color earns it the nickname “fool’s gold,” but pyrite is harder and more brittle than native gold. Pyrite commonly tarnishes to brown, gray, or iridescent coatings.

Field identification & locations

Identify by its brassy color, metallic luster, brittleness, and lack of malleability; a streak test gives a greenish-black to brown-black streak, unlike gold’s yellow streak. Common localities include Peru, Spain, Italy, China, the United States, and Canada.