mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow with a metallic luster; Crystal structure: Isometric (often cubic or pyritohedral); Cleavage: Indistinct; Specific gravity: 4.9-5.2.

Hardness: 6-6
Color: Pale brass-yellow with a metallic luster

Identified May 7, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow with a metallic luster; Crystal structure: Isometric (often cubic or pyritohedral); Cleavage: Indistinct; Specific gravity: 4.9-5.2.

Formation & geological history

Forms in diverse environments including magmatic segregation, hydrothermal veins, and as a common authigenic mineral in sedimentary rocks like shales. It can form across all geological ages.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is used in the production of lithium batteries, as a semiconductor material, and as collector specimens.

Geological facts

Commonly known as Fool's Gold due to its metallic luster and yellow hue. It was used in early firearms like the wheel-lock to create sparks to ignite gunpowder.

Field identification & locations

Identify by its hardness (it can scratch glass, unlike gold) and its greenish-black streak. Commonly found in quartz veins or dark sedimentary rocks. Collectors look for well-defined cubic crystals.