mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric/Cubic; Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

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

Identified June 8, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric/Cubic; Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

Formation & geological history

Formed in hydrothermal veins, by magmatic segregation, or through sedimentation in anaerobic environments around the world across various geological ages.

Uses & applications

Used historically as a source of sulfur and sulfuric acid. Today, it is used in jewelry (as marcasite), in radio receivers, and as a popular collector's mineral.

Geological facts

Commonly known as Fool's Gold because of its visual similarity to gold, though it is much harder and more brittle. It can produce sparks when struck against steel.

Field identification & locations

Identify by its cubic crystal habit and brassy color. Found globally in metamorphic, sedimentary, and igneous rocks. To distinguish from gold, look for a greenish-black streak and brittleness.