mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow with a metallic luster; Crystal System: Isometric (often cubic, octahedral, or pyritohedral); Streak: Greenish-black to brownish-black; Specific Gravity: 4.9–5.2.

Hardness: 6-6
Color: Pale brass-yellow with a metallic luster
Streak: Greenish-black to brownish-black

Identified February 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed in a variety of geological settings including hydrothermal veins, as an accessory mineral in igneous rocks, in contact metamorphic rocks, and as a result of bacterial activity in sedimentary environments. It is found in rocks of all geological ages.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is used in the production of lithium batteries, as a semiconductor material, in jewelry (often falsely called 'marcasite'), and as a popular collector's specimen.

Geological facts

Commonly known as 'Fool\'s Gold' because its color and high density led novice prospectors to mistake it for real gold. Unlike gold, pyrite is brittle and will shatter if struck, while gold is malleable. It can also create sparks when struck against steel.

Field identification & locations

Identify in the field by its brassy color, metallic luster, and hardness (it can scratch glass but cannot be scratched by a copper penny). It is found globally, with notable deposits in Spain, Italy, Russia, and the USA. Collectors look for sharp, mirror-like cubic faces.