mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on the Mohs scale; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic); Cleavage: Indistinct; Specific Gravity: 4.8-5.0

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

Identified July 31, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on the Mohs scale; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic); Cleavage: Indistinct; Specific Gravity: 4.8-5.0

Formation & geological history

Forms in a wide variety of geological environments, from hydrothermal veins to sedimentary rocks and metamorphic deposits, often associated with other sulfides and oxides.

Uses & applications

Used historically for ignition of fire, manufacturing of sulfur and sulfuric acid, and popularly collected as a mineral specimen.

Geological facts

Commonly known as 'Fool's Gold' due to its metallic luster and pale yellow hue, which has frequently deceived inexperienced prospectors.

Field identification & locations

Identified by its brassy yellow color, cubic crystal habit, high specific gravity, and blackish green streak. Found worldwide in sedimentary, igneous, and metamorphic rocks.