mineral

Pyrite (Tumbled)

Iron Disulfide (FeS2)

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

Hardness: 6-6
Color: Brass-yellow
Luster: Metallic

Identified July 21, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in a variety of geological environments including sedimentary rocks (through anaerobic bacterial action), hydrothermal veins, and as an accessory mineral in igneous rocks.

Uses & applications

Used as a source of sulfur and sulfuric acid in industry; widely used in jewelry (as marcasite) and as a popular specimen for collectors.

Geological facts

Commonly known as 'Fool's Gold' due to its resemblance to real gold, though it is much harder and more brittle. It can create sparks when struck against steel.

Field identification & locations

Identify by its metallic luster, brassy color, and high hardness (it cannot be scratched by a copper penny or knife). Commonly found worldwide in mining districts.