mineral

Pyrite

Iron Sulfide (FeS2)

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

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

Identified June 14, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in a variety of geological settings, including hydrothermal veins, as an accessory mineral in igneous rocks, in contact metamorphic rocks, and in sedimentary rocks like shale and coal.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is used in the manufacture of paper, chemicals, and as a popular collector's mineral. Occasionally used in jewelry (marcasite jewelry).

Geological facts

Commonly known as Fool's Gold due to its resemblance to precious metals. It can actually contain small amounts of real gold within its crystal structure. It can create sparks when struck against steel.

Field identification & locations

Identify by its cubic crystals, metallic luster, and greenish-black streak (unlike gold, which has a yellow streak). Found worldwide, with notable deposits in Peru, Spain, and the USA.