mineral

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

Pyrite, FeS₂, dispersed in a dark metamorphic or hydrothermal host rock

AI-generated identification · may be incorrect

Identified August 19, 2026More mineral →

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Physical properties

Brassy yellow metallic grains and streaks, uneven massive texture, and likely Mohs hardness about 6–6.5 for pyrite; pyrite has cubic crystal structure and no cleavage, while the host appears dark brown-gray and weathered. The image is insufficient to confirm the exact host rock or distinguish pyrite from other sulfides.

Formation & geological history

Pyrite commonly forms in hydrothermal veins, sedimentary beds, and metamorphic sulfide deposits through sulfur-rich fluid or sediment reactions; specimens may range from Precambrian to recent geological ages. Common localities include Spain, Peru, Italy, China, and many mining regions worldwide.

Uses & applications

Pyrite is collected for its metallic appearance and used historically as a sulfur source; associated sulfide ores may contain copper, gold, or other valuable metals. It is generally unsuitable for jewelry because it oxidizes and can crumble.

Geological facts

Often called “fool’s gold,” pyrite is denser and harder than gold and typically has a dark greenish-black streak rather than gold’s yellow streak. Oxidation can produce sulfuric acid and rusty iron sulfates.

Field identification & locations

Look for a metallic brass color, high density, brittle fracture, and black streak; a streak test, hardness test, and specific-gravity check are useful. Avoid prolonged moisture exposure.