mineral

Pyrite (likely)

Iron disulfide, FeS₂; commonly called “fool’s gold”

AI-generated identification · may be incorrect

Brassy yellow metallic luster with an irregular, granular surface; Mohs hardness 6–6.5, cubic crystal system, indistinct cleavage, and specific gravity about 5.0. The image shows a small, weathered metallic sulfide specimen, though exact identification is limited by the photo.

Identified September 5, 2026More mineral →

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Physical properties

Formation & geological history

Pyrite forms in hydrothermal veins and sedimentary rocks, especially marine mudstones and limestones, through sulfur- and iron-rich chemical reactions. It formed throughout geologic time, commonly from Paleozoic to younger sediments.

Uses & applications

Used historically as a sulfur source and currently in mineral collecting, teaching, and limited industrial sulfuric-acid production; it has little jewelry value because it tarnishes and can oxidize.

Geological facts

Its brassy color resembles gold, but pyrite is harder, more brittle, and commonly leaves a dark greenish-black streak rather than a yellow streak.

Field identification & locations

Look for metallic brassy color, high density, brittle fracture, and a dark streak; a steel nail generally will not scratch it. Common localities include Peru, Spain, Italy, China, and sedimentary deposits worldwide.