mineral

Metallic sulfide-bearing pebble, likely pyrite in quartz or host rock

Probable pyrite (FeS₂), possibly with chalcopyrite (CuFeS₂) in a quartz-rich matrix

AI-generated identification · may be incorrect

Small rounded gray-brown specimen with bright brassy metallic flecks; likely Mohs hardness 6–6.5 for pyrite, specific gravity about 5.0, opaque, metallic luster, and cubic or granular crystal structure. Exact identification is uncertain from the photograph alone.

Identified September 3, 2026More mineral →

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At a glance

Common name: Metallic sulfide-bearing pebble, likely pyrite in quartz or host rock
Scientific name: Probable pyrite (FeS₂), possibly with chalcopyrite (CuFeS₂) in a quartz-rich matrix
Category: mineral
Identified: September 3, 2026
Method: Standard

AI Estimated Value

About $1–$10 as an unidentified common fragment; attractive crystal specimens may sell for $10–$100 or more.

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

Sulfide minerals commonly form in hydrothermal veins, sedimentary deposits, and metamorphic rocks through mineral-rich fluid precipitation. The specimen’s age cannot be determined visually and depends on its geological locality.

Uses & applications

Pyrite is collected as a mineral specimen and historically used as an iron and sulfur source; chalcopyrite is an important copper ore. This small piece has little industrial or jewelry value.

Geological facts

Pyrite is called “fool’s gold” because its brassy appearance resembles gold, but it is harder, more brittle, and commonly tarnishes. A streak test, hardness test, and inspection for cubic crystals can distinguish it from gold.

Field identification & locations

Look for brassy metallic grains, blackish streak, brittle fracture, and cubic faces; gold leaves a yellow streak and is malleable. Common localities include Spain, Peru, China, the United States, and Canada; professional testing is needed for certainty.