mineral

Pyrite

Iron Sulfide (FeS2)

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 1, 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 igneous, metamorphic, and sedimentary rocks via hydrothermal activity or precipitation from marine sediments in low-oxygen environments.

Uses & applications

Used as an ore to extract sulfur for sulfuric acid production; historically used in firearms (wheel-locks); popular as an ornamental stone and in jewelry.

Geological facts

Commonly known as Fool's Gold due to its resemblance to real gold; however, it is harder, more brittle, and creates a greenish-black streak when scratched compared to gold's yellow streak.

Field identification & locations

Identify by its metallic luster, golden color, and cubic crystal habits; commonly found in Spain, Peru, Italy, and the USA. Collectors look for well-defined cubes or dodecahedrons.