mineral

Pyrite

Iron Sulfide (FeS2)

AI-generated identification · may be incorrect

Hardness: 6-6.5 on Mohs scale; Color: brass-yellow; Luster: metallic; Crystal structure: isometric/cubic; Cleavage: indistinct; Specific gravity: 4.9-5.2

Hardness: 6-6
Color: brass-yellow
Luster: metallic

Identified May 10, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: brass-yellow; Luster: metallic; Crystal structure: isometric/cubic; Cleavage: indistinct; Specific gravity: 4.9-5.2

Formation & geological history

Forms in diverse environments including hydrothermal veins, sedimentary rocks (as concretions), and as an accessory mineral in igneous and metamorphic rocks across all geological ages.

Uses & applications

Primarily used in the production of sulfuric acid for industry. Historically used to create sparks for firearms (wheellock) and as a gemstone during the Victorian Era.

Geological facts

Commonly known as Fool's Gold because its color and metallic luster often led prospectors to mistake it for real gold. Unlike gold, pyrite is brittle and leaves a greenish-black streak.

Field identification & locations

Identify by its cubic crystal habit, brassy color, and high hardness (it can scratch glass). It frequently occurs in coal seams and shale deposits globally.