mineral
Pyrite (fool’s gold)
Pyrite, FeS₂
AI-generated identification · may be incorrectBrassy yellow, metallic luster, commonly cubic crystals; Mohs hardness 6–6.5, specific gravity about 5.0, with poor cleavage and uneven fracture. The specimen appears to be a small, granular pyrite-rich piece.
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Physical properties
Brassy yellow, metallic luster, commonly cubic crystals; Mohs hardness 6–6.5, specific gravity about 5.0, with poor cleavage and uneven fracture. The specimen appears to be a small, granular pyrite-rich piece.
Formation & geological history
Forms when iron and sulfur combine in oxygen-poor environments, including hydrothermal veins and sedimentary rocks; it occurs in rocks of many geological ages.
Uses & applications
Used historically as a source of sulfur and in limited industrial applications; today it is mainly a teaching, display, and collecting specimen.
Geological facts
Pyrite is often mistaken for gold, but it is harder, more brittle, and can form distinctive striated cubes.
Field identification & locations
Look for its brassy metallic color, high density, brittleness, and cubic habit; common worldwide in sedimentary deposits and hydrothermal veins. A small common specimen like this typically sells for about $2–$15.
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