mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on the Mohs scale. Color: Pale brass-yellow, tarnishing darker. Luster: Metallic. Crystal structure: Isometric (cubic). Cleavage: Indistinct. Specific gravity: 4.8-5.0.

Hardness: 6-6
Color: Pale brass-yellow, tarnishing darker
Luster: Metallic

Identified July 29, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on the Mohs scale. Color: Pale brass-yellow, tarnishing darker. Luster: Metallic. Crystal structure: Isometric (cubic). Cleavage: Indistinct. Specific gravity: 4.8-5.0.

Formation & geological history

Forms in a wide variety of geological settings, including igneous rocks, sedimentary rocks, and hydrothermal vein deposits, often at high to low temperatures.

Uses & applications

Historically used to strike fire, currently used in the manufacture of sulfur and sulfuric acid, and popular among mineral collectors and for novelty jewelry.

Geological facts

Commonly known as 'Fool's Gold' due to its superficial resemblance to gold, though it is much harder, lighter in weight, and leaves a greenish-black streak.

Field identification & locations

Easily identified by its brass-yellow metallic color, high hardness (cannot be scratched with a penny), and cubic crystal habits or conchoidal fracture.