mineral

Pyrite (iron pyrite)

Pyrite, FeS₂

AI-generated identification · may be incorrect

Brassy gold metallic luster with granular, glittering crystals; Mohs hardness 6–6.5, cubic crystal system, no prominent cleavage, and specific gravity about 5.0. The specimen’s rough, granular appearance is typical of pyrite, though image alone cannot confirm identity.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms in many settings, including hydrothermal veins and sedimentary rocks, through reactions involving iron and sulfur. It occurs in rocks of many geological ages.

Uses & applications

Collected as a mineral specimen and used historically as a source of sulfur and iron; it is also studied in geology and mineral processing. It is not generally valued as gold jewelry material.

Geological facts

Its metallic luster and gold color earned it the nickname “fool’s gold,” but pyrite is harder and more brittle than gold.

Field identification & locations

Look for brassy color, glittering crystals, and a dark streak; pyrite is common worldwide in veins and sedimentary deposits. Avoid relying on color alone, since other minerals can look similar.