mineral

Pyrite (fool’s gold)

Pyrite, FeS₂

AI-generated identification · may be incorrect

Brassy yellow with metallic luster and irregular, granular surfaces; Mohs hardness 6–6.5, cubic crystal system, no prominent cleavage, and specific gravity about 5.0. The specimen’s appearance is consistent with pyrite, though a photo cannot confirm identity.

Identified October 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms in many geological settings, including hydrothermal veins and sedimentary rocks, by crystallization or chemical precipitation. Pyrite occurs across a wide range of geological ages.

Uses & applications

Used as a source of sulfur and historically for sulfuric-acid production; attractive specimens are collected and occasionally used decoratively, but it is not usually a durable jewelry stone.

Geological facts

Its brassy color can resemble gold, but pyrite is harder and typically brittle; a streak test gives a dark greenish-black to brownish-black powder.

Field identification & locations

Look for a brass-yellow metallic sheen, brittle fracture, and dark streak; crystals are often cubic, though massive forms are common. Found worldwide, including Spain, Peru, and the United States.