mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

AI-generated identification · may be incorrect

Hardness: 6-6.5 (Mohs), Color: Pale brass-yellow, Luster: Metallic, Crystal Structure: Isometric (cubic), Cleavage: Indistinct, Specific Gravity: 4.8-5.0

Hardness: 6-6

Identified July 7, 2026More mineral →

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Physical properties

Hardness: 6-6.5 (Mohs), Color: Pale brass-yellow, Luster: Metallic, Crystal Structure: Isometric (cubic), Cleavage: Indistinct, Specific Gravity: 4.8-5.0

Formation & geological history

Formed in hydrothermal veins, as an accessory mineral in igneous rocks, and by precipitation in sedimentary environments with low oxygen. Found across various geological ages.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, used in lithium batteries, as a semiconductor material, and as collector specimens and jewelry.

Geological facts

Pyrite gets its name from the Greek 'pyros' meaning fire, because it produces sparks when struck against metal or stone. It's often mistaken for gold due to its metallic luster.

Field identification & locations

Identify by its brassy color, cubic crystal habit, and greenish-black streak (unlike real gold). Commonly found in quartz veins and coal beds worldwide.