mineral

Pyrite (“fool’s gold”)

Pyrite, FeS₂

AI-generated identification · may be incorrect

Brassy yellow to silvery-gold metallic luster with granular, glittering crystals; Mohs hardness 6–6.5, cubic crystal system, no prominent cleavage, specific gravity about 5.0. The specimen’s appearance is consistent with pyrite, though image identification is not definitive.

Identified October 6, 2026More mineral →

Explore Pyrite (“fool’s gold”) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms when iron and sulfur combine in oxygen-poor sedimentary settings, hydrothermal veins, and some igneous or metamorphic rocks. Pyrite occurs across a wide range of geological ages.

Uses & applications

Used as a collector specimen and historically as a source of sulfur for sulfuric acid; it has also been used decoratively, but is generally unsuitable for jewelry because it can tarnish and fracture.

Geological facts

Its metallic gleam earned the nickname “fool’s gold,” but unlike gold it is brittle and commonly forms cubic crystals.

Field identification & locations

Look for brassy metallic color, hard edges, and brittle fracture; it will not flatten like gold. Common worldwide, including Spain, Peru, China, and the United States.