mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5 Mohs; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic/pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.8–5.0

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

Identified April 9, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic/pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.8–5.0

Formation & geological history

Forms in high and low-temperature hydrothermal veins, by magmatic segregation, in contact metamorphic deposits, and in sedimentary rocks as a primary or authigenic mineral.

Uses & applications

Source of sulfur and iron (though sulfur often weakens the iron); previously used to create sparks in wheel-lock firearms; widely used in jewelry (as marcasite) and as a collector specimen.

Geological facts

Commonly known as "Fool's Gold" because Its metallic luster and brassy yellow hue cause it to be mistaken for gold by inexperienced prospectors.

Field identification & locations

Identify by its hardness (scratches glass, unlike gold) and its greenish-black streak when rubbed against a streak plate. Commonly found in coal beds and association with quartz veins.