mineral

Mixed mineral specimens, prominently chalcopyrite and amethyst

Chalcopyrite (CuFeS₂) with secondary copper minerals; amethyst, purple quartz (SiO₂)

AI-generated identification · may be incorrect

The left specimen appears brassy, iridescent chalcopyrite with metallic luster and Mohs hardness 3.5–4; the purple specimen is amethyst, vitreous, Mohs 7, with quartz’s trigonal crystal structure. Other pieces may include metallic sulfides and banded or altered host rock; exact identification requires testing.

Identified September 13, 2026More mineral →

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At a glance

Common name: Mixed mineral specimens, prominently chalcopyrite and amethyst
Scientific name: Chalcopyrite (CuFeS₂) with secondary copper minerals; amethyst, purple quartz (SiO₂)
Category: mineral
Identified: September 13, 2026
Method: Standard

AI Estimated Value

About $5–$30 for common rough pieces; attractive large or well-crystallized specimens may sell for $50–$200+.

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

Chalcopyrite forms in hydrothermal copper deposits, while amethyst crystallizes in silica-rich volcanic cavities, commonly during the Mesozoic to Cenozoic. The pictured assortment appears to be hand-collected mining specimens rather than one rock.

Uses & applications

Chalcopyrite is an important copper ore; amethyst is used for jewelry, carvings, and mineral collecting. These rough specimens are primarily educational or decorative.

Geological facts

Iridescent chalcopyrite is often sold as “peacock ore,” though the colors usually result from surface oxidation or artificial treatment. Amethyst’s purple color is caused mainly by iron-related defects and irradiation.

Field identification & locations

Identify chalcopyrite by its brassy color, tarnish, metallic streak, and softer hardness than pyrite; amethyst by purple quartz properties and lack of cleavage. Common sources include Mexico, Peru, Brazil, Uruguay, and the western United States.