mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 (Mohs scale); Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (often cubic or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

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

Identified March 29, 2026More mineral →

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Physical properties

Hardness: 6-6.5 (Mohs scale); Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (often cubic or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

Formation & geological history

Formed in high and low-temperature hydrothermal veins, as an accessory mineral in igneous rocks, and in sedimentary environments through the action of sulfate-reducing bacteria. It is found in rocks of all geological ages.

Uses & applications

Currently used as a source of sulfur and in the production of sulfuric acid; historically used to create sparks for firearms. It is frequently sold as an ornamental mineral for collectors and used in costume jewelry.

Geological facts

Commonly known as 'Fool's Gold' because its color and metallic luster frequently confused prospectors during the Gold Rush. Despite being an iron mineral, it is rarely used as an ore of iron due to its high sulfur content.

Field identification & locations

Identify in the field by its cubic shape, metallic luster, and its inability to be scratched by a copper penny or steel knife. It creates a greenish-black streak when rubbed on unglazed porcelain. Commonly found in mining districts worldwide, specifically Peru, Spain, and the USA.