mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6.0-6.5 on Mohs scale; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (often cubic or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2

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

Identified June 25, 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 (often cubic or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2

Formation & geological history

Formed in diverse environments including magmatic segregation, hydrothermal veins, and as an authigenic mineral in sedimentary rocks. It occurs across all geological ages.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today it is used in jewelry (as marcasite), in car batteries, and as a popular collector specimen.

Geological facts

Often called 'Fool's Gold' because its color and high density lead novice prospectors to mistake it for gold. It can create sparks when struck against steel.

Field identification & locations

Identify by its brassy color, green-black streak (gold has a yellow streak), and cubic crystal habit. Commonly found in Peru, Spain, and the USA. Collectors look for sharp, mirror-like crystal faces.