mineral

Pyrite

Iron Pyrite (FeS2)

AI-generated identification · may be incorrect

Hardness: 6-6.5 on Mohs scale. Color: Pale brass-yellow to golden. Luster: Metallic. Crystal structure: Isometric (cubic). Cleavage: Indistinct. Specific gravity: 4.9-5.2.

Hardness: 6-6
Color: Pale brass-yellow to golden
Luster: Metallic

Identified July 14, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale. Color: Pale brass-yellow to golden. Luster: Metallic. Crystal structure: Isometric (cubic). Cleavage: Indistinct. Specific gravity: 4.9-5.2.

Formation & geological history

Formed in high and low temperature hydrothermal veins, by magmatic segregation, and as an accessory mineral in igneous and sedimentary rocks. Common in coal beds and as a replacement mineral in fossils.

Uses & applications

Historically a source of sulfur and sulfuric acid. Used in jewelry (marketed as 'marcasite'), as a grit for grinding, and as a popular specimen for mineral collectors.

Geological facts

Widely known as 'Fool's Gold' because its color and metallic luster often led prospectors to mistake it for real gold. Unlike gold, pyrite is brittle and produces a greenish-black streak when rubbed on a porcelain plate.

Field identification & locations

Identify in the field by its brassy color, cubic crystal habit, and hardness (it can scratch glass). Found globally, with notable deposits in Spain, Peru, and the United States (Arizona, Colorado, Pennsylvania).