mineral

Pyrite

Iron Disulfide (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: 4.8-5.0

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

Identified June 8, 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: 4.8-5.0

Formation & geological history

Formed in hydrothermal veins, as an accessory mineral in igneous rocks, in contact metamorphic rocks, and in sedimentary rocks such as shale and coal. It forms at both high and low temperatures.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is used in the manufacture of lithium batteries, as a semiconductor material, and widely collected as a decorative mineral or jewelry (marcasite jewelry).

Geological facts

Commonly known as Fool's Gold due to its resemblance to precious metals. During the Gold Rush, many miners were deceived by its golden luster. It can spark when struck against steel.

Field identification & locations

Identify by its brittle nature (gold is malleable), brassy color, and greenish-black streak on a porcelain plate. Found globally, with famous deposits in Spain, Peru, Italy, and the USA.