mineral

Pyrite (likely a small pyrite crystal aggregate)

Pyrite, iron disulfide (FeS₂)

AI-generated identification · may be incorrect

Brassy yellow with metallic luster and visible striated crystal faces; Mohs hardness 6–6.5, cubic crystal system, no prominent cleavage, and specific gravity about 5.0. The specimen’s small size and lighting make precise identification uncertain.

Identified October 9, 2026More mineral →

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Physical properties

Formation & geological history

Pyrite forms in many settings, including hydrothermal veins and sedimentary rocks, through mineral precipitation under sulfur-rich conditions. It occurs from ancient rocks to modern deposits.

Uses & applications

Used chiefly as a source of sulfur and historically for sulfuric-acid production; attractive crystals are collected and occasionally used decoratively, but are not suitable for most jewelry.

Geological facts

Nicknamed “fool’s gold,” pyrite is harder and more brittle than gold and commonly forms cubic crystals.

Field identification & locations

Look for a brassy metallic color, high density, brittleness, and often striated faces; common worldwide in sedimentary and hydrothermal deposits. A clear photo or hardness/streak tests would help confirm the identification.