mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5 (Mohs scale); Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (often cubic, octahedral, or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2; Streak: Greenish-black to brownish-black.

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

Identified June 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed in high and low temperature hydrothermal veins, as an accessory mineral in igneous rocks, in contact metamorphic rocks, and in sedimentary rocks such as shale and coal. It can form in environments with low oxygen levels.

Uses & applications

Used in the production of sulfur dioxide for the paper industry and sulfuric acid for chemical manufacturing. Historically used as a source of ignition for firearms. Popular in jewelry (as marcasite) and as a collector specimen.

Geological facts

Commonly known as 'Fool's Gold' due to its resemblance to precious metals. Unlike gold, it is brittle and creates sparks when struck against steel. It is the most common sulfide mineral on Earth.

Field identification & locations

Identify in the field by its metallic luster, internal brassy color, and greenish-black streak. It is found globally, with notable deposits in Peru, Spain, and the USA. It often occurs near quartz veins or in shale beds.