mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: brassy yellow/pale gold; Luster: metallic; Crystal system: isometric (cubic, octahedral, pyritohedral); Cleavage: poor/indistinct; Specific Gravity: 4.8-5.0

Hardness: 6-6
Color: brassy yellow/pale gold
Luster: metallic

Identified June 29, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: brassy yellow/pale gold; Luster: metallic; Crystal system: isometric (cubic, octahedral, pyritohedral); Cleavage: poor/indistinct; Specific Gravity: 4.8-5.0

Formation & geological history

Forms in diverse environments including hydrothermal veins, sedimentary rocks through biological activity, and as an accessory mineral in igneous rocks across all geological ages.

Uses & applications

Used historically as a source of sulfur and sulfuric acid. Today used in some batteries, solar panels, as a common specimen for collectors, and occasionally in jewelry (often mislabeled as marcasite).

Geological facts

Commonly known as Fool's Gold because its color often confused prospectors with real gold. It can produce sparks when struck against steel, which made it vital for early firearms like the wheel-lock.

Field identification & locations

Identify by its cubic crystal habit and brassy color. Unlike gold, it is brittle (gold is malleable) and leaves a greenish-black streak on a porcelain plate. Common locations include Peru, Spain, and Italy.