mineral

Pyrite in Matrix

Iron Sulfide (FeS2)

Hardness: 6-6.5 (Mohs); Color: Brass-yellow, metallic gold; Luster: Metallic; Crystal Structure: Isometric (cubes, pyritohedrons); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

Hardness: 6-6
Color: Brass-yellow, metallic gold
Luster: Metallic

Identified July 15, 2026More mineral →

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Physical properties

Hardness: 6-6.5 (Mohs); Color: Brass-yellow, metallic gold; Luster: Metallic; Crystal Structure: Isometric (cubes, pyritohedrons); 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 rocks through metamorphic processes. It is common in contact metamorphic deposits and coal beds.

Uses & applications

Used historically as a source of sulfur and sulfuric acid. Today, it is primarily a popular collector's mineral and is occasionally used in jewelry (marcasite jewelry), though its main industrial value is as an iron ore byproduct.

Geological facts

Commonly known as "Fool's Gold" due to its resemblance to real gold. Unlike gold, it is brittle, leaves a greenish-black streak, and cannot be scratched by a copper penny.

Field identification & locations

Identify by its cubic crystal habit, brassy color, and high density. Found globally, with notable deposits in Peru, Spain, and the USA. Collectors look for sharp, unoxidized crystal faces.