mineral

Pyrite

Iron Sulfide (FeS2)

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

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

Identified May 10, 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, pyritohedron); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

Formation & geological history

Forms in diverse environments including hydrothermal veins, as an accessory mineral in igneous rocks, in contact metamorphic rocks, and in sedimentary rocks like shale and coal. It forms under both high and low temperature conditions.

Uses & applications

Used primarily for the production of sulfur dioxide (sulfuric acid) and as an ornamental stone. While it contains iron, it is rarely used as an iron ore due to the difficulty of removing sulfur. Used in jewelry as 'marcasite'.

Geological facts

Often called 'Fool's Gold' due to its superficial resemblance to gold. It was used in early firearms like the wheel-lock to create sparks. Some specimens contain small amounts of actual gold as inclusions.

Field identification & locations

Identify by its hardness (will scratch glass, unlike gold) and its greenish-black streak. It is found globally, with famous deposits in Spain, Italy, and the USA. Collectors look for sharp cubic crystals or 'pyrite suns'.