mineral

Pyrite (iron pyrite)

Pyrite, FeS₂; cubic iron sulfide

AI-generated identification · may be incorrect

Brassy-gold metallic luster with blocky, striated cubic crystals; Mohs hardness 6–6.5, specific gravity about 5.0, and no prominent cleavage. The specimen’s reflective, angular crystals are characteristic of pyrite.

Identified October 3, 2026More mineral →

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Physical properties

Formation & geological history

Forms in many settings, including hydrothermal veins, sedimentary rocks, and metamorphic deposits. It crystallizes as iron and sulfur combine; pyrite occurs from ancient deposits of many geological ages.

Uses & applications

Used historically as a source of sulfur and, less commonly, iron; today it is chiefly a mineral specimen and collector’s display piece. Its metallic appearance has also inspired jewelry, though it can tarnish and is brittle.

Geological facts

Pyrite is nicknamed “fool’s gold,” but is harder and more brittle than gold. Its crystal habit commonly includes cubes with parallel striations on their faces.

Field identification & locations

Look for a brassy color, metallic shine, cubic form, and dark streak; unlike gold, pyrite is brittle and may leave a greenish-black streak. Common worldwide, including Spain, Peru, Italy, and the United States.