mineral

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

Pyrite, FeS₂, possibly in a micaceous metamorphic matrix

AI-generated identification · may be incorrect

Brassy gray-gold metallic luster with granular crystals; pyrite hardness is 6–6.5 Mohs, cubic/isometric, with poor cleavage and specific gravity about 5.0. The specimen appears fine-grained and irregular rather than showing obvious cubes.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

Pyrite forms in sulfur- and iron-rich hydrothermal, sedimentary, and metamorphic environments; associated schist may have formed during regional metamorphism, commonly Paleozoic or older depending on locality.

Uses & applications

Used historically as a sulfur source and today in mineral collecting, education, and limited industrial applications; attractive crystalline pieces are sold as specimens, but this small matrix piece has modest value.

Geological facts

Often called “fool’s gold,” pyrite is harder and more brittle than gold and can leave a dark greenish-black streak, whereas gold leaves a yellow streak and is malleable.

Field identification & locations

Identify by metallic brassy color, heavy feel, hardness, and dark streak; a steel nail generally does not scratch pyrite. Common worldwide in hydrothermal veins, coal beds, sedimentary rocks, and metamorphic deposits.