mineral

Pyrite

Iron Sulfide (FeS2)

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

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

Identified July 1, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in diverse environments including magmatic segregation, hydrothermal veins, and sedimentary rocks (as inclusions in shale, coal, and limestone) through the reaction of iron and sulfur. It is found in geological formations across all ages.

Uses & applications

Mainly used as a source of sulfur for sulfuric acid production; historically used in firearms (wheel-locks) and as a semiconductor in early radio receivers; popular as ornamental decorative pieces and for educational mineral sets.

Geological facts

Commonly known as "Fool's Gold" due to its metallic luster and yellow hue mimicking gold. It is the most common sulfide mineral and can produce sparks when struck against steel.

Field identification & locations

Identify in the field by its greenish-black streak, brassy color, and high hardness (it cannot be scratched by a copper penny, unlike real gold). Commonly found worldwide, with notable deposits in Spain, Italy, and the USA.