mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (cubic, octahedral, pyritohedron); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

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

Identified March 20, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (cubic, octahedral, pyritohedron); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

Formation & geological history

Formed in a wide variety of environments including magmatic segregation, hydrothermal veins, and sedimentary deposits under anaerobic conditions. It is found in rocks of all geological ages from the Precambrian to recent.

Uses & applications

Used industrially for the production of sulfur dioxide (sulfuric acid) and as an iron ore (though less common due to sulfur impurities). Frequently sold as 'Fool's Gold' in museum shops and used in costume jewelry or as a healing crystal.

Geological facts

Known as 'Fool's Gold' because its color and high specific gravity lead amateur prospectors to mistake it for gold. However, it is much harder than gold and brittle rather than malleable. It can strike sparks when hit against steel.

Field identification & locations

Identify in the field by its brassy color, metallic luster, and blackish-green streak on a porcelain plate. It is commonly found globally, notably in Rio Tinto (Spain), Peru, and the United States (Huanzala). Collectors should look for distinct cubic shapes.