mineral

Pyrite (Fool's Gold) in Matrix

Iron Disulfide (FeS2)

AI-generated identification · may be incorrect

Hardness: 6-6.5 Mohs; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (often cubic or pyritohedral); Cleavage: Poor/Indistinct; Specific Gravity: 4.9-5.2

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

Identified July 18, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (often cubic or pyritohedral); Cleavage: Poor/Indistinct; Specific Gravity: 4.9-5.2

Formation & geological history

Forms in a wide variety of geological environments including hydrothermal veins, sedimentary rocks (via replacement), and as an accessory mineral in igneous rocks. It can form at high or low temperatures.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is primarily used for jewelry (marcasite jewelry), as an ornamental stone, and as a collector's specimen. It is also an important ore for associated gold and copper.

Geological facts

Pyrite is nicknamed 'Fool's Gold' because its color and high specific gravity can lead novice prospectors to mistake it for gold. However, pyrite is much harder than gold and brittle rather than malleable.

Field identification & locations

Identify in the field by its brassy color, metallic luster, and blackish-green streak. It can be found globally, with significant deposits in Spain, Italy, and the USA. Collectors look for well-defined cubic crystals.