mineral

Pyrite-bearing rock (likely pyrite in a quartz-rich matrix)

Pyrite (FeS₂), with a light-colored quartz-rich host; exact host rock is unclear from the image

AI-generated identification · may be incorrect

Metallic, brassy-to-silvery reflective grains in a rough pale matrix; pyrite has Mohs hardness 6–6.5, cubic crystals, and no true cleavage. The specimen’s specific gravity and host composition cannot be determined visually.

Identified October 7, 2026More mineral →

Explore Pyrite-bearing rock (likely pyrite in a quartz-rich matrix) in the encyclopedia →

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Physical properties

Formation & geological history

Pyrite forms in hydrothermal veins and sedimentary or metamorphic settings; the matrix may be quartz-rich. No age or precise formation environment can be established from the image alone.

Uses & applications

Pyrite specimens are collected for display and teaching; pyrite has also been mined as a source of sulfur and historically mistaken for gold.

Geological facts

Pyrite is known as “fool’s gold,” but is harder and more brittle than gold and commonly forms cubic crystals.

Field identification & locations

Look for brassy metallic grains, brittleness, and dark streak; gold is softer, malleable, and leaves a yellow streak. Common worldwide in mineral veins and sedimentary rocks; the pictured host is not identifiable with confidence.