mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Hardness: 6-6.5 Mohs. Color: Pale brass-yellow. Luster: Metallic. Crystal structure: Isometric. Cleavage: Indistinct. Specific gravity: 4.9-5.2.
- Hardness
- 6-6
- Color
- Pale brass-yellow
- Luster
- Metallic
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Physical properties
Hardness: 6-6.5 Mohs. Color: Pale brass-yellow. Luster: Metallic. Crystal structure: Isometric. Cleavage: Indistinct. Specific gravity: 4.9-5.2.
Formation & geological history
Formed in high and low-temperature hydrothermal veins, by magmatic segregation, and as an accessory mineral in igneous, metamorphic, and sedimentary rocks (including coal beds and carbonate rocks).
Uses & applications
Major ore for sulfur/sulfuric acid; used in radio receivers (crystal detectors) historically; popular for jewelry (often called marcasite in the trade) and as a collector's specimen.
Geological facts
Known as 'Fool's Gold' because its color and metallic luster often misled prospectors. Unlike gold, pyrite is brittle and leaves a greenish-black streak when rubbed on a porcelain plate.
Field identification & locations
Identify by its brassy color, cubic crystal habits, and high hardness (it can scratch glass). Found globally, with famous deposits in Spain, Peru, Italy, and the USA.
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