mineral

Pyrite in Matrix

Iron Disulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (cubic/pyritohedron); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

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

Identified June 4, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (cubic/pyritohedron); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

Formation & geological history

Formed in hydrothermal veins, by magmatic segregation, or as an authigenic mineral in sedimentary environments. Common in metamorphic rocks and coal deposits.

Uses & applications

Primary source of sulfur and sulfuric acid used in chemical industries. Also used as a collector specimen and sometimes in costume jewelry.

Geological facts

Commonly known as 'Fool's Gold' because its color and weight are similar to gold. Unlike gold, it is brittle and will blacken and release a sulfur smell when heated.

Field identification & locations

Identify by its metallic luster, golden color, cubic crystal habit, and greenish-black streak. Commonly found in Peru, Spain, Italy, and the USA. Collectors look for sharp, unoxidized crystal faces.