mineral

Pyrite-rich sulfide ore (likely pyrite with chalcopyrite)

Pyrite, FeS₂; possible chalcopyrite, CuFeS₂, and minor quartz or sphalerite

AI-generated identification · may be incorrect

Brassy yellow metallic luster, granular/intergrown crystals, and gray-black matrix; pyrite hardness 6–6.5 Mohs, chalcopyrite 3.5–4, with cubic or massive crystal habits. The specimen appears naturally mineralized rather than polished.

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins, volcanic-hosted massive sulfide deposits, or sedimentary sulfide beds when sulfur-rich fluids precipitated iron and copper sulfides. Such deposits range from ancient Precambrian ores to younger volcanic systems.

Uses & applications

Collected as a metallic mineral specimen and historically processed for sulfur, iron, and sometimes copper; attractive crystals are used decoratively, but it is not a gemstone-grade material.

Geological facts

Pyrite is known as “fool’s gold,” though its harder, paler, less malleable character distinguishes it from native gold. Chalcopyrite commonly tarnishes to iridescent purple, blue, or green colors.

Field identification & locations

Identify by metallic brass color, high density, lack of malleability, and a dark streak; pyrite commonly forms cubes, while chalcopyrite is softer and more iridescent. Common localities include Spain, Peru, Mexico, China, and the United States.