mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

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

Hardness: 6-6
Color: Brass-yellow
Luster: Metallic

Identified July 5, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in a wide variety of environments including igneous, metamorphic, and sedimentary rocks. It result from hydrothermal activity or cooling of magma containing high sulfur and iron content.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is used in the manufacture of paper, lithium batteries, and as a popular specimen for collectors.

Geological facts

Named from the Greek word 'pyr' meaning fire, because it emits sparks when struck by metal. Its resemblance to gold led to its famous nickname during the various gold rushes.

Field identification & locations

Identified in the field by its metallic luster, yellowish-brass color, and dark greenish-black streak (unlike gold, which has a golden-yellow streak). Commonly found in Spain, Peru, Italy, and the USA.