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: Indistinct; Specific Gravity: 4.9-5.2.

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

Identified May 7, 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: Indistinct; Specific Gravity: 4.9-5.2.

Formation & geological history

Formed in a variety of environments including hydrothermal veins, as an accessory mineral in igneous rocks, in contact metamorphic rocks, and in sedimentary rocks like shale and coal. It can form across all geological ages.

Uses & applications

Primarily used in the production of sulfur dioxide for the paper industry and sulfuric acid for chemical manufacturing. Occasionally used as a gemstone (marcasite jewelry) or for decorative purposes.

Geological facts

Commonly known as Fool's Gold due to its metallic luster and yellow hue. It can actually contain small amounts of real gold, and it sparks when struck against steel.

Field identification & locations

Identify in the field by its brassy color, cubic crystal habit, and high hardness (it cannot be scratched by a copper penny or knife, unlike real gold). Commonly found in mining waste piles or embedded in sedimentary shale.