mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal system: Isometric/Cubic; Cleavage: Indistinct; Specific Gravity: 4.9-5.2

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

Identified July 11, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal system: Isometric/Cubic; Cleavage: Indistinct; Specific Gravity: 4.9-5.2

Formation & geological history

Forms in a wide variety of geological settings, including hydrothermal veins, as a primary mineral in igneous rocks, and as a replacement mineral in sedimentary rocks. It can be found in rocks of almost every age.

Uses & applications

Primarily used as an ore of sulfur for the production of sulfuric acid. Also used in jewelry (as marcasite), crystal sets, and historically as a spark-producer for firearms.

Geological facts

Known as Fool's Gold due to its resemblance to precious metal. Unlike gold, pyrite is brittle and leaves a greenish-black streak when rubbed on a porcelain plate. It is the most common sulfide mineral.

Field identification & locations

Identify by its cubic crystal habit, high density, and metallic luster. Common worldwide, especially in metamorphic and sedimentary deposits. Collectors look for well-defined cubic or pyritohedron shapes.