mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5 (Mohs scale); Color: Pale brass-yellow to gold; Luster: Metallic; Crystal system: Isometric/Cubic; Cleavage: Indistinct; Specific Gravity: 4.9-5.2; Streak: Greenish-black to brownish-black.

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

Identified April 10, 2026More mineral →

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Physical properties

Formation & geological history

Formed in a wide range of geological environments, including hydrothermal veins, sedimentary rocks under reducing conditions, and as an accessory mineral in igneous rocks. It can range in age from billions of years old to relatively recent deposits.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is used in the manufacture of lithium batteries, as a semiconductor material, for educational purposes, and as a popular collector's mineral.

Geological facts

Commonly known as 'Fool's Gold' because its color and metallic luster often misled prospectors. It can create sparks when struck against steel, which is how it earned its name (derived from the Greek word 'pyr' meaning fire).

Field identification & locations

Identify in the field by its brittle nature (gold is malleable), its hardness (will scratch glass), and its greenish-black streak. Commonly found in association with quartz and other sulfide minerals in mining districts worldwide.