mineral

Pyrite

Iron sulfide (FeS2)

AI-generated identification · may be incorrect

Hardness of 6-6.5 on Mohs scale. Brassy yellow color, metallic luster. Isometric crystal structure, often forming cubes or pyritohedrons. Poor cleavage, specific gravity of 4.9-5.2.

Identified September 19, 2026More mineral →

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Physical properties

Hardness of 6-6.5 on Mohs scale. Brassy yellow color, metallic luster. Isometric crystal structure, often forming cubes or pyritohedrons. Poor cleavage, specific gravity of 4.9-5.2.

Formation & geological history

Forms in a variety of environments, including igneous, metamorphic, and sedimentary rocks. Often found in hydrothermal veins and as a replacement mineral in fossils.

Uses & applications

Historically used as a source of sulfur for sulfuric acid production. Also used in the creation of marcasite jewelry and as a collector's mineral.

Geological facts

Known as 'Fool's Gold' due to its superficial resemblance to gold. Can spark when struck against steel, which led to its use in early firearms.

Field identification & locations

Can be distinguished from gold by its greater hardness (cannot be scratched with a fingernail or pocket knife), its brittle nature (shatters instead of flattening when hit), and its greenish-black streak. Common worldwide.