mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow; Luster: Metallic, gleaming; Crystal Structure: Isometric; Cleavage: Indistinct; Specific Gravity: 4.8-5.0

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

Identified August 2, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow; Luster: Metallic, gleaming; Crystal Structure: Isometric; Cleavage: Indistinct; Specific Gravity: 4.8-5.0

Formation & geological history

Forms in a wide variety of geological environments, from hydrothermal veins to sedimentary rocks and metamorphic deposits, often crystallizing at high to low temperatures.

Uses & applications

Used historically for producing sparks to start fires, in the manufacture of sulfur and sulfuric acid, and popularly as a collector's mineral and in jewelry.

Geological facts

Commonly known as 'Fool's Gold' due to its pale brass-yellow color and metallic luster resembling actual gold, though pyrite is harder and leaves a greenish-black streak.

Field identification & locations

Easily identified by its brassy color, metallic luster, high specific gravity, and cubic or nodular crystal habits. Found globally, notably in Peru, Spain, and the USA.