mineral

Likely chalcopyrite-bearing sulfide ore

Chalcopyrite (CuFeS₂), possibly with pyrite and/or sphalerite

AI-generated identification · may be incorrect

Brassy yellow to bronze metallic patches in a dark, massive matrix; metallic luster and irregular fracture are visible. Chalcopyrite has Mohs hardness 3.5–4, tetragonal crystals when well formed, and high specific gravity (~4.1–4.3); exact identification requires testing.

Identified August 19, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins, porphyry-copper systems, and volcanogenic massive sulfide deposits, commonly alongside pyrite, sphalerite, galena, and quartz. Specimen age depends on its deposit, ranging from Precambrian to modern geological settings.

Uses & applications

Primary copper ore used for electrical wiring, alloys, and industrial copper production; attractive metallic specimens are collected, though it is rarely used as a gemstone.

Geological facts

Chalcopyrite is often called “peacock ore” when artificially or naturally tarnished into iridescent purple, blue, and green colors. It is softer and more golden than pyrite.

Field identification & locations

Identify by its brassy color, softness, and dark streak; a steel scratch should mark it, while a copper penny may scratch it. Common localities include Peru, Mexico, Canada, the United States, and Australia; the image alone cannot exclude pyrite-rich ore.