mineral

Possible chalcopyrite-bearing sulfide fragment

Likely chalcopyrite (CuFeS₂), possibly with pyrite or bornite

AI-generated identification · may be incorrect

Small metallic, brassy-gold to greenish fragment with granular texture; chalcopyrite has Mohs hardness 3.5–4, metallic luster, tetragonal crystals, uneven fracture, and specific gravity about 4.1–4.3. The image is somewhat blurred, so exact identification is uncertain.

Identified August 22, 2026More mineral →

Explore Possible chalcopyrite-bearing sulfide fragment in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms mainly in hydrothermal copper deposits, commonly with pyrite, sphalerite, and galena; most specimens formed during ore-deposit activity from the Precambrian through the Cenozoic.

Uses & applications

Important copper ore; attractive crystalline pieces are collected, though it is rarely used as a gemstone because it tarnishes and is relatively soft. Typical small specimens are worth about $3–$25, with exceptional crystals costing more.

Geological facts

Its iridescent blue-green tarnish is often marketed as “peacock ore,” though this appearance may be natural or artificially treated. A copper-streak test and chemical analysis distinguish it reliably from pyrite.

Field identification & locations

Look for brassy metallic color, softness, high density, and possible iridescent tarnish; chalcopyrite is common in copper-mining regions worldwide, including Peru, Mexico, Canada, and the United States. A metallic streak and lack of cubic crystal form help separate it from pyrite.