mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (cubic/pyritohedron); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

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

Identified June 28, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (cubic/pyritohedron); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

Formation & geological history

Forms in a wide variety of geological settings including hydrothermal veins, as an accessory mineral in igneous rocks, in contact metamorphic rocks, and in sedimentary rocks such as shale and coal.

Uses & applications

Used historically as a source of sulfur and in the production of sulfuric acid; also used in jewelry (as 'marcasite'), radio detectors, and as a popular collector specimen.

Geological facts

Commonly known as 'Fool's Gold' because its color and metallic luster often cause it to be mistaken for real gold by inexperienced prospectors. Unlike gold, it is brittle and will powder when crushed.

Field identification & locations

Identify in the field by its cubic crystal form, brassy color, and greenish-black streak when rubbed on a porcelain plate. Commonly found globally, with notable deposits in Peru, Spain, Italy, and the USA.