mineral

Weathered metallic sulfide-bearing rock, possibly chalcopyrite ore

Likely chalcopyrite (CuFeS₂) in a weathered host rock; identification is uncertain from the photograph

AI-generated identification · may be incorrect

Brassy bronze-gold metallic patches occur in a dark gray, granular matrix with rusty oxidation. Chalcopyrite has Mohs hardness 3.5–4, metallic luster, tetragonal crystals, and poor cleavage; the specimen appears heavily weathered and may include iron oxides.

Identified August 10, 2026More mineral →

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At a glance

Common name: Weathered metallic sulfide-bearing rock, possibly chalcopyrite ore
Scientific name: Likely chalcopyrite (CuFeS₂) in a weathered host rock; identification is uncertain from the photograph
Category: mineral
Identified: August 10, 2026
Method: Standard

AI Estimated Value

About $1–$10 for an ordinary rough fragment; $20–$100+ for verified, colorful crystal specimens.

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 in hydrothermal veins or magmatic sulfide deposits, commonly millions to billions of years old. Surface weathering oxidizes sulfides to reddish-brown iron oxides and copper-bearing minerals.

Uses & applications

Chalcopyrite is an important copper ore; attractive crystals are collected, but this rough fragment has little jewelry or construction use.

Geological facts

Chalcopyrite is commonly mistaken for gold, but it is softer, less dense, and often shows iridescent tarnish. A streak test, hardness test, and copper assay are more reliable than color alone.

Field identification & locations

Look for brassy metallic color, green-black or brown oxidation, and a dark streak; it should not scratch glass. Common localities include porphyry-copper and volcanogenic massive-sulfide districts worldwide.