mineral

Pyrite

Iron Sulfide (FeS2)

AI-generated identification · may be incorrect

Hardness: 6-6.5 Mohs, Color: Brass-yellow, Luster: Metallic, Crystal Structure: Isometric (cubic), Cleavage: Indistinct, Specific Gravity: 4.8-5.0

Hardness: 6-6

Identified June 8, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs, Color: Brass-yellow, Luster: Metallic, Crystal Structure: Isometric (cubic), 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. Found globally in deposits of all ages.

Uses & applications

Historically a source of sulfur and sulfuric acid. Today used in some lithium batteries, as a semiconductor, and widely as a jewelry (marcasite) and collector specimen.

Geological facts

Commonly known as Fool's Gold because its color often confuses it with real gold. It can create sparks when struck against steel. The name comes from the Greek 'pyros' meaning fire.

Field identification & locations

Identify by its brassy color, hardness (it can scratch glass unlike gold), and its greenish-black streak. Commonly found in Spain, Peru, Italy, and the USA.