mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5 Mohs scale; Color: Brass-yellow, pale gold; Luster: Metallic; Crystal Structure: Isometric-pyritohedron (cubic); Cleavage: Indistinct; Specific Gravity: 4.8-5.0

Hardness: 6-6
Color: Brass-yellow, pale gold
Luster: Metallic

Identified June 15, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs scale; Color: Brass-yellow, pale gold; Luster: Metallic; Crystal Structure: Isometric-pyritohedron (cubic); Cleavage: Indistinct; Specific Gravity: 4.8-5.0

Formation & geological history

Formed in a variety of geological settings including hydrothermal veins, sedimentary rocks (by replacement of organic matter), and as an accessory mineral in igneous rocks. Found in strata ranging from Precambrian to recent times.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is used primarily in lithium batteries, as a semiconductor, and as a popular specimen for mineral collectors and inexpensive jewelry.

Geological facts

Commonly known as 'Fool's Gold' due to its resemblance to real gold. Unlike gold, it is brittle and leaves a greenish-black streak on a porcelain plate, while gold leaves a yellow streak.

Field identification & locations

Identify by its metallic luster, golden hue, and cubic crystal shapes. It is commonly found worldwide, notably in Spain (Rio Tinto), Italy, and the USA. For collectors, look for well-defined sharp-edged cubes.