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: 4.8-5.0.
- 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: 4.8-5.0.
Formation & geological history
Formed in high and low-temperature hydrothermal veins, by magmatic segregation, and in sedimentary rocks under reducing conditions. It is common in metamorphic rocks like schist.
Uses & applications
Source of sulfur for sulfuric acid production; used as a crystal detector in early radio receivers; popular in jewelry during the Victorian era and currently for mineral collecting.
Geological facts
Known as 'Fool's Gold' because its color and metallic luster frequently lead novice prospectors to mistake it for real gold. It can spark when struck against steel.
Field identification & locations
Identify by its brittle nature (gold is malleable), brassy yellow color, and blackish-green streak on a porcelain plate. Found globally in diverse geological settings.
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