mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

AI-generated identification · may be incorrect

Hardness: 6-6.5 Mohs. Color: Pale brass-yellow. Luster: Metallic. Crystal structure: Isometric (often cubic or pyritohedral). Cleavage: Indistinct. Specific gravity: 4.8-5.0.

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

Identified April 12, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs. Color: Pale brass-yellow. Luster: Metallic. Crystal structure: Isometric (often cubic or pyritohedral). Cleavage: Indistinct. Specific gravity: 4.8-5.0.

Formation & geological history

Forms in diverse conditions including hydrothermal veins, as an accessory mineral in igneous rocks, in contact metamorphic rocks, and in sedimentary environments like coal beds and shales.

Uses & applications

Historically a source of sulfur and sulfuric acid. Used in the production of iron vitriol. Used today as a gemstone (marcasite jewelry) and as an ornamental mineral for collectors.

Geological facts

Its name comes from the Greek word 'pyr' meaning fire, because it emits sparks when struck by metal. It is the most common sulfide mineral.

Field identification & locations

Identify by its metallic luster, golden color, and green-black streak (real gold has a yellow streak). Found worldwide; famous localities include Spain (Rio Tinto) and Italy (Elba).