mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
AI-generated identification · may be incorrectHardness: 6-6.5 (Mohs), Color: Brass-yellow, Luster: Metallic, Crystal System: Isometric (often cubic or pyritohedral), Cleavage: Indistinct/Poor, Specific Gravity: 4.9-5.2
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 (Mohs), Color: Brass-yellow, Luster: Metallic, Crystal System: Isometric (often cubic or pyritohedral), Cleavage: Indistinct/Poor, Specific Gravity: 4.9-5.2
Formation & geological history
Formed in hydrothermal veins, as an accessory mineral in igneous rocks, in contact metamorphic rocks, and in sedimentary rocks like coal and shale through biological or chemical replacement processes.
Uses & applications
Historically used for the production of sulfuric acid and sulfur. It is occasionally used as a gemstone (marcasite jewelry) and is popular among mineral collectors.
Geological facts
Known as Fool's Gold due to its resemblance to real gold. Unlike gold, which is soft and leaves a yellow streak, pyrite is brittle and leaves a greenish-black streak. It can spark when struck against steel.
Field identification & locations
Identified by its brassy color, high hardness (cannot be scratched by a penny), and metallic sheen. Commonly found worldwide in diverse geological environments from quartz veins to coal beds.
