mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5; Color: Brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Poor/indistinct; Specific Gravity: 4.9-5.2

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

Identified June 21, 2026More mineral →

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Physical properties

Hardness: 6-6.5; Color: Brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Poor/indistinct; Specific Gravity: 4.9-5.2

Formation & geological history

Forms in a variety of environments including magmatic segregation, hydrothermal veins, and sedimentary rocks through the reaction of iron and sulfur in anaerobic conditions.

Uses & applications

Used in the production of sulfur dioxide for sulfuric acid, historically as a source of sparks in firearms, and as a popular collector's mineral and gemstone.

Geological facts

Commonly known as 'Fool's Gold' because its color and luster led prospectors to mistake it for real gold. Unlike gold, pyrite is brittle and leaves a greenish-black streak.

Field identification & locations

Identify by its hardness (it can scratch glass), its brittle nature when struck, and its greenish-black streak on porcelain. Found globally in coal beds, limestone, and metamorphic deposits.