mineral

Pyrite

Iron Disulfide (FeS2)

AI-generated identification · may be incorrect

Hardness: 6-6.5 Mohs scale. Color: Pale brass-yellow. Luster: Metallic. Crystal structure: Isometric (cubic). Cleavage: Indistinct. Specific gravity: 4.9-5.2.

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

Identified June 22, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs scale. Color: Pale brass-yellow. Luster: Metallic. Crystal structure: Isometric (cubic). Cleavage: Indistinct. Specific gravity: 4.9-5.2.

Formation & geological history

Forms in a wide variety of environments including sedimentary deposits, hydrothermal veins, and as an accessory mineral in igneous rocks. Present in rocks of all geological ages.

Uses & applications

Historically a source of sulfur and sulfuric acid. Today used in jewelry (as marcasite), lapidary arts, and as an ore of iron or for the extraction of trace gold found within its lattice.

Geological facts

Commonly known as Fool's Gold due to its resemblance to real gold. Unlike gold, it is brittle and will shatter if struck, and it produces a black/green streak rather than yellow.

Field identification & locations

Identify by its cubic crystal habit, brassy luster, and hardness (it scratches glass). Found globally, notably in Spain, Italy, and the USA. Collectors look for well-defined cubes or pyritohedrons.