mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5 on 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 May 21, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in a variety of geological settings including hydrothermal veins, as an accessory mineral in igneous rocks, in metamorphic rocks, and even in sedimentary rocks like shale and coal via precipitation in low-oxygen environments.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is primarily used as an ore of gold (when found with it), in the manufacturing of lithium batteries, and as a popular collector's mineral and gemstone base.

Geological facts

Pyrite is famously known as 'Fool's Gold' due to its resemblance to real gold. Unlike real gold, it is brittle and will spark when struck against steel, which led to its use in wheel-lock firearms.

Field identification & locations

Identify by its hardness (it can scratch glass), metallic luster, and greenish-black streak. Common in mines worldwide, notably in Spain, Italy, and the USA. Collectors look for well-defined cubic or pyritohedron crystal shapes.