mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (cubic); Cleavage: Indistinct; Specific Gravity: 4.8-5.0

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

Identified May 18, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (cubic); Cleavage: Indistinct; Specific Gravity: 4.8-5.0

Formation & geological history

Formed in hydrothermal veins by precipitation from hot, mineral-rich fluids. It also occurs in sedimentary rocks as a result of organic matter decomposition in oxygen-poor environments and in metamorphic rocks.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is used in the manufacture of paper and fertilizer, as a semiconductor material, and frequently as a popular collector's specimen and jewelry component.

Geological facts

Commonly known as Fool's Gold due to its resemblance to precious metals. During the gold rush, many inexperienced miners mistook it for real gold. Unlike gold, pyrite is brittle and leaves a greenish-black streak.

Field identification & locations

Identify in the field by its metallic luster, golden hue, and cubic crystal habit. It is often found associated with quartz, calcite, and other sulfide minerals. Common locations include Spain, Italy, and the United States.