mineral

Weathered metallic sulfide fragment, possibly pyrite-bearing rock

Likely iron sulfide (pyrite, FeS₂) in a weathered host rock; exact identification requires testing

AI-generated identification · may be incorrect

Brassy yellow-gray color with dull to weak metallic luster, irregular granular texture, and no obvious cleavage; estimated Mohs hardness 6–6.5 if pyrite, though the pictured weathered matrix may be softer. The rounded, oxidized surface suggests alteration rather than a fresh crystal face.

Identified September 21, 2026More mineral →

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At a glance

Common name: Weathered metallic sulfide fragment, possibly pyrite-bearing rock
Scientific name: Likely iron sulfide (pyrite, FeS₂) in a weathered host rock; exact identification requires testing
Category: mineral
Identified: September 21, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small ordinary fragment; $10–$50 or more if it proves to be a well-crystallized or locality-documented 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

Pyrite forms in hydrothermal veins, sedimentary rocks, and metamorphic settings from sulfur- and iron-rich fluids; deposits range from Precambrian to recent. Weathering produces brown, gray, or greenish oxidation coatings and may remove the original brassy luster.

Uses & applications

Common pyrite is used chiefly as a geological indicator and collector specimen; historically it supplied sulfur for sulfuric acid production. It has limited jewelry use because it tarnishes and can crumble when weathered.

Geological facts

Pyrite is commonly called “fool’s gold,” but it is harder, more brittle, and typically less malleable than native gold. A streak test, hardness test, and specific-gravity measurement are needed to distinguish it from chalcopyrite, marcasite, or gold.

Field identification & locations

Look for brassy metallic color, cubic crystal forms, dark greenish-black streak, and inability to be cut or flattened like gold; avoid powdering unknown sulfides. Common occurrences include sedimentary beds, quartz veins, and ore districts worldwide.