mineral

Pyrite

Iron Sulfide (FeS2)

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

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

Identified June 24, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in a variety of geological settings including hydrothermal veins, as an accessory mineral in igneous rocks, in contact metamorphic rocks, and in sedimentary rocks like shale and coal through chemical precipitation in oxygen-poor environments.

Uses & applications

Primarily used as an ore for sulfur and sulfuric acid production; also used in jewelry (as marcasite), in early firearms (wheel-locks), and as a collector's specimen.

Geological facts

Commonly known as 'Fool's Gold' due to its resemblance to real gold. It can generate sparks when struck against steel. Some specimens contain trace amounts of actual gold within their crystal structure.

Field identification & locations

Identify in the field by its brittle nature (gold is malleable), brassy color, and greenish-black streak. Commonly found worldwide, with notable deposits in Spain, Peru, Italy, and the USA (Arizona and Pennsylvania).