mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 Mohs; Color: Pale brass-yellow to golden-yellow; Luster: Metallic; Crystal structure: Isometric (cubes, pyritohedrons); Cleavage: Indistinct; Specific gravity: 4.9-5.2.

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

Identified May 10, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs; Color: Pale brass-yellow to golden-yellow; 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 by sedimentary precipitation in oxygen-poor environments. It can be found in rocks from virtually all geological ages.

Uses & applications

Historically used as a source of sulfur for sulfuric acid; currently used in lithium batteries, as a semiconductor material, and widely collected as a decorative specimen and in jewelry (often mislabeled as marcasite).

Geological facts

Commonly known as 'Fool's Gold' because its color and metallic luster often misguide novice prospectors. Unlike gold, it is brittle and will shatter if struck, and it produces a black/greenish streak on porcelain.

Field identification & locations

Identify in the field by its brassy color, hardness (it can scratch glass), and cubic crystal habits. Found globally in Peru, Spain, Italy, and the USA. Collectors look for sharp, mirror-like faces on crystal cubes.