mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5 (Mohs); Color: Brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.8-5.0

Hardness: 6-6
Color: Brass-yellow
Luster: Metallic

Identified March 15, 2026More mineral →

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Physical properties

Hardness: 6-6.5 (Mohs); Color: Brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.8-5.0

Formation & geological history

Forms in diverse environments including hydrothermal veins, as an accessory mineral in igneous rocks, and in sedimentary rocks through biological activity in low-oxygen conditions. Found across all geological ages.

Uses & applications

Major industrial source of sulfur and sulfuric acid. Used as a component in lithium batteries, as a flux in jewelry making, and highly valued as a decorative collector specimen.

Geological facts

Commonly known as 'Fool's Gold' because its brassy color resembles gold. It is unique among sulfide minerals for its ability to form near-perfect cubes. Though it contains iron, it is rarely used as an iron ore because the sulfur is difficult to remove.

Field identification & locations

Identify by its brittle nature and greenish-black streak (real gold is malleable and has a yellow streak). Commonly found in Spain (Navajún), Italy, Peru, and the USA. Collectors look for sharp cubic forms and 'striations' (fine lines) on crystal faces.