mineral

Pyrite (“fool’s gold”)

Pyrite, FeS₂; cubic iron sulfide

AI-generated identification · may be incorrect

Brassy metallic luster with glittering, granular crystals; Mohs hardness 6–6.5, specific gravity about 5.0. The specimen appears to be a small, rough pyrite-rich piece, though the photo alone cannot confirm its identity.

Identified October 1, 2026More mineral →

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Physical properties

Formation & geological history

Forms in many settings, including hydrothermal veins and sedimentary rocks, when iron and sulfur react under low-oxygen conditions. Pyrite occurs across geological ages.

Uses & applications

Collected as a mineral specimen; historically used as a source of sulfur and, in some deposits, associated with valuable metals. Its brittleness and tendency to weather limit jewelry and construction uses.

Geological facts

Pyrite is often mistaken for gold, but it is harder, more brittle, and commonly forms angular crystals.

Field identification & locations

Look for a pale brass color, metallic sparkle, and brittle fracture; it leaves a dark streak rather than gold’s yellow streak. Common worldwide, including Spain, Peru, and the United States.