mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5 Mohs; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Poor/Indistinct; Specific Gravity: 4.9-5.2

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

Identified July 19, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Poor/Indistinct; Specific Gravity: 4.9-5.2

Formation & geological history

Formed in a variety of geological environments including hydrothermal veins, as an accessory mineral in igneous rocks, in metamorphic rocks, and as a replacement mineral in sedimentary rocks and fossils.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today reflects values in gemstone collecting, metaphysical uses, and as an ore of gold in some specific deposits.

Geological facts

Commonly known as 'Fool's Gold' due to its metallic luster and brassy hue which often deceive novice prospectors. Unlike gold, it is brittle and creates a black/greenish-black streak.

Field identification & locations

Identify in the field by its brassy color, cubic crystal habits, and high hardness (it cannot be scratched by a copper penny or a knife). Found globally with notable deposits in Spain, Peru, and Italy.