mineral

Metallic sulfide-bearing ore, likely pyrite-rich rock

Pyrite (FeS₂), possibly mixed with quartz or other sulfides

AI-generated identification · may be incorrect

Brassy silver-gold metallic luster, granular texture, and irregular fracture; pyrite is cubic/isometric, Mohs hardness 6–6.5, and specific gravity about 5.0. The specimen appears weathered and matrix-bearing, so visual identification is not definitive.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins, sedimentary rocks, and metamorphic environments through sulfur-rich mineralizing fluids; deposits range from Precambrian to modern geological ages. Common associated minerals include quartz, calcite, chalcopyrite, and sphalerite.

Uses & applications

Pyrite has historically been mined for sulfur and iron and is collected as a mineral; attractive crystals may be used decoratively, but it has little gemstone value. Sulfide ores can be economically important sources of copper, zinc, lead, or gold.

Geological facts

Often called “fool’s gold,” pyrite is harder and more brittle than gold and commonly tarnishes or oxidizes to iron sulfates. The visible bright metallic grains could also include arsenopyrite or native metal, which require testing for confirmation.

Field identification & locations

Common in hydrothermal veins and sedimentary deposits worldwide, especially Spain, Peru, Italy, China, and the United States. Check streak, hardness, crystal form, magnetism, and specific gravity; avoid acid or heat tests without safety precautions.