mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2

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

Identified July 21, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2

Formation & geological history

Forms in diverse environments including magmatic segregation, hydrothermal veins, and as an authigenic mineral in sedimentary rocks. Found throughout all geological ages.

Uses & applications

Used industrially as a source of sulfur and sulfuric acid. Historically used to create sparks for firearms. Frequently sold as mineral specimens and used in costume jewelry (often sold as 'marcasite').

Geological facts

Commonly known as 'Fool's Gold' due to its resemblance to real gold, though it is much harder and more brittle. It can produce sparks when struck against steel.

Field identification & locations

Identify by its brassy color, cubic crystal habit, and greenish-black streak (gold has a yellow streak). It is common worldwide, with major deposits in Spain, Peru, and the USA.