mineral

Pyrite (Cube variety)

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to dull brown (when oxidized); Luster: Metallic; Crystal Structure: Isometric/Cubic; Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

Hardness: 6-6
Color: Pale brass-yellow to dull brown (when oxidized)
Luster: Metallic

Identified March 15, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to dull brown (when oxidized); Luster: Metallic; Crystal Structure: Isometric/Cubic; Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

Formation & geological history

Formed in both igneous and metamorphic environments, but most commonly via hydrothermal veins or as a replacement mineral in sedimentary rocks. It can form across all geological ages from the Archean to the present.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is primarily used as a minor iron ore, in the production of lithium batteries, as a popular collector's mineral, and in jewelry (often sold as 'marcasite').

Geological facts

Commonly nicknamed 'Fool's Gold' due to its resemblance to precious metal. When struck against steel or flint, it creates sparks, leading to its name derived from the Greek word 'pyr' meaning fire.

Field identification & locations

Identified in the field by its distinct cubic shape, brittle nature, and greenish-black streak (real gold has a yellow streak). Commonly found in Spain (Navajún), Peru, Italy, and various locations across the USA.