mineral

Pyrite Cube in Matrix

Iron Sulfide (FeS2)

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

Hardness: 6-6
Color: Pale brass-yellow to brownish-black
Luster: Metallic

Identified July 28, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in sedimentary, igneous, and metamorphic environments through hydrothermal activity or low-temperature aqueous solutions, often within shales, limestones, or coal beds.

Uses & applications

Used in mineral collections, educational displays, jewelry, and historically as a source of sulfur and sulfuric acid.

Geological facts

Commonly nicknamed 'Fool's Gold' due to its metallic luster and brass-yellow hue resembling real gold. Striking natural cubic crystal formations are highly sought after by collectors.

Field identification & locations

Easily identified in the field by its distinct cubic crystal habit, high specific gravity, metallic brassy color, and greenish-black streak. Found worldwide in various geological settings.