mineral

Pyrite-bearing rock (likely pyrite-rich sulfide ore)

Pyrite, FeS₂, with possible dark host rock; exact matrix is not identifiable from the photo

AI-generated identification · may be incorrect

Brassy to bronze metallic sparkle on a dark, irregular specimen. Pyrite has Mohs hardness 6–6.5, cubic crystal structure, no true cleavage, and specific gravity about 5; individual crystal shape is unclear here.

Identified September 30, 2026More mineral →

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Physical properties

Formation & geological history

Pyrite forms in hydrothermal veins, sedimentary environments, and metamorphic rocks when iron and sulfur combine. Its age depends on the host deposit and cannot be determined visually.

Uses & applications

Collected as a mineral specimen; pyrite has been used as a sulfur source and historically for striking sparks. It is generally not used as jewelry because it can tarnish and weather.

Geological facts

Pyrite is popularly called “fool’s gold,” but is harder and more brittle than gold. Oxidation of pyrite can produce sulfuric acid and rusty iron oxides.

Field identification & locations

Look for a brassy metallic sheen and brittle fracture; gold is softer, malleable, and leaves a yellow streak, while pyrite typically gives a dark greenish-black streak. Pyrite occurs worldwide in hydrothermal veins and sedimentary rocks.