mineral

Raw green pyrite

Pyrite, FeS₂ (likely nickel-bearing or oxidized greenish pyrite)

AI-generated identification · may be incorrect

Brassy to greenish metallic luster with granular/crystalline texture; Mohs hardness 6–6.5, cubic crystal system, poor cleavage, and specific gravity about 5.0. The green color may reflect surface alteration, inclusions, or lighting; true bright-green pyrite is uncommon.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins and sedimentary rocks through sulfur-rich reactions involving iron, commonly during diagenesis or metamorphism. It occurs in rocks of many ages, from Precambrian deposits to modern mineral-forming environments.

Uses & applications

Used historically as a minor sulfur source and collected as a mineral specimen; attractive pieces may be used decoratively, but it is not normally a gemstone. It can oxidize and produce acidic sulfate minerals when exposed to moisture.

Geological facts

Pyrite is called “fool’s gold” because its metallic appearance resembles gold, though it is harder, lighter in color, and more brittle. The small specimen appears consistent with pyrite but cannot be confirmed from a photograph alone.

Field identification & locations

Look for metallic luster, dense heft, brittleness, and cubic or granular crystals; a streak test should be greenish-black to brown-black, unlike gold’s yellow streak. Common localities include Peru, Spain, Italy, China, and the United States.