mineral

Pyrite

Iron Sulfide (FeS2)

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

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

Identified May 16, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in diverse geological environments including hydrothermal veins, sedimentary rocks (via bacteria reducing sulfate), and as an accessory mineral in igneous and metamorphic rocks.

Uses & applications

Source of sulfur for sulfuric acid production; historically used in firearms (wheel-locks); today used for jewelry (as marcasite), in radio receivers, and high-energy lithium batteries.

Geological facts

Widely known as 'Fool's Gold' because its color mislead many prospectors. Despite the nickname, it often occurs alongside real gold and can be used as a 'pathfinder' mineral.

Field identification & locations

Identify by its hardness (it can scratch glass, unlike gold) and its brittle nature (it shatters when hit, while gold flattens). It leaves a greenish-black streak on porcelain.