mineral

Quartz-bearing sulfide ore, possibly pyrite in altered host rock

Likely pyrite (FeS₂) with quartz and possibly calcite or carbonate gangue; exact identification requires testing

AI-generated identification · may be incorrect

Irregular, metallic-to-submetallic specimen with brassy-gold patches, dark sulfide material, and pale gray/beige gangue. Pyrite has Mohs hardness 6–6.5, cubic crystals, poor cleavage, and specific gravity about 5.0; the photograph does not clearly show crystal form.

Identified August 23, 2026More mineral →

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At a glance

Common name: Quartz-bearing sulfide ore, possibly pyrite in altered host rock
Scientific name: Likely pyrite (FeS₂) with quartz and possibly calcite or carbonate gangue; exact identification requires testing
Category: mineral
Identified: August 23, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common rough specimen; $30–$150+ if crystals are well formed, large, or visibly gold-bearing.

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

Typically forms in hydrothermal veins, sedimentary replacement deposits, and metamorphic rocks when sulfur-bearing fluids precipitate iron sulfides. Deposits range from ancient Precambrian systems to young active hydrothermal environments.

Uses & applications

Pyrite is mined as a sulfur and occasional gold-associated ore; quartz-bearing pieces are common teaching and collector specimens rather than construction stone.

Geological facts

Often called “fool’s gold,” but pyrite is harder and more brittle than gold and commonly tarnishes to brown or iridescent colors.

Field identification & locations

Look for a brass-yellow metallic color, blackish streak, high density, and brittle fracture; a streak test and hardness test help distinguish it from gold. Common worldwide in hydrothermal and sedimentary ore districts.