mineral

Tumbled metallic sulfide mineral, likely pyrite

Pyrite (FeS₂), tentatively; possibly marcasite or a pyrite-rich nodule

AI-generated identification · may be incorrect

Small rounded specimen with metallic gray-brassy luster and granular/crystalline texture. Pyrite hardness is 6–6.5 Mohs, cubic crystal system, brittle, with no prominent cleavage and specific gravity about 5.0; the image is insufficient for confident identification.

Identified September 7, 2026More mineral →

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At a glance

Common name: Tumbled metallic sulfide mineral, likely pyrite
Scientific name: Pyrite (FeS₂), tentatively; possibly marcasite or a pyrite-rich nodule
Category: mineral
Identified: September 7, 2026
Method: Standard

AI Estimated Value

Approximately $2–$15 for a small common tumbled specimen; $20–$100+ if it proves to be an attractive, well-crystallized or locality-specific specimen.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Likely formed hydrothermally or in sedimentary environments through sulfide mineral precipitation; pyrite ranges from Precambrian to modern geological settings. Marcasite is chemically identical but orthorhombic and less stable.

Uses & applications

Collected as a mineral specimen and occasionally used as a sulfur source; pyrite is sometimes cut as a novelty gemstone, while sulfide ores can be economically important for associated metals.

Geological facts

Pyrite is commonly called “fool’s gold,” but its darker metallic appearance here is not diagnostic. A streak test, hardness test, density, and crystal-form examination would distinguish it from galena, hematite, and marcasite.

Field identification & locations

Common in hydrothermal veins, coal beds, shales, and sedimentary rocks worldwide, especially Peru, Spain, Italy, and the United States. Pyrite leaves a greenish-black streak and typically scratches glass; avoid prolonged moisture, which can cause deterioration.