mineral

Pyrite

Iron Sulfide (FeS2)

AI-generated identification · may be incorrect

Hardness: 6.0-6.5 on Mohs scale. Color: Pale brass-yellow. Luster: Metallic. Crystal Structure: Isometric/Cubic. Streak: Greenish-black to brownish-black. Specific Gravity: 4.95-5.10.

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

Identified July 26, 2026More mineral →

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Physical properties

Hardness: 6.0-6.5 on Mohs scale. Color: Pale brass-yellow. Luster: Metallic. Crystal Structure: Isometric/Cubic. Streak: Greenish-black to brownish-black. Specific Gravity: 4.95-5.10.

Formation & geological history

Forms in a wide variety of geological environments including hydrothermal veins, magmatic segregation, contact metamorphism, and sedimentary deposits rich in organic material.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is popular in mineral collections, costume jewelry (often sold as 'marcasite' jewelry), and ornamental crafts.

Geological facts

Nicknamed 'Fool\'s Gold' because its brassy yellow metallic luster frequently led inexperienced prospectors to mistake it for real gold. Unlike soft, malleable gold, pyrite is brittle and leaves a dark streak.

Field identification & locations

Can be identified by its distinctive metallic luster, brassy hue, hardness (scratches glass), and greenish-black streak. Common worldwide, with famous fine specimens coming from Peru, Spain, Italy, and the USA.