mineral
Pyrite
Iron Pyrite (FeS2)
Hardness: 6.0-6.5 on Mohs scale. Color: Brass-yellow to pale gold with a metallic luster. Crystal Structure: Isometric/cubic. Cleavage: Poor/indistinct. Streak: Greenish-black to brownish-black. Specific gravity: 4.95-5.10.
- Hardness
- 6
- Color
- Brass-yellow to pale gold with a metallic luster
- Streak
- Greenish-black to brownish-black
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Physical properties
Hardness: 6.0-6.5 on Mohs scale. Color: Brass-yellow to pale gold with a metallic luster. Crystal Structure: Isometric/cubic. Cleavage: Poor/indistinct. Streak: Greenish-black to brownish-black. Specific gravity: 4.95-5.10.
Formation & geological history
Forms in hydrothermal veins, sedimentary rocks, metamorphic rocks, and coal beds through volcanic or hydrothermal precipitation of sulfur and iron.
Uses & applications
Historically used to produce sulfur dioxide for sulfuric acid production. Today, primarily used in jewelry, home decor, educational crystal sets, and collector specimens.
Geological facts
Nickname: 'Fool's Gold' because its color and luster frequently tricked inexperienced prospectors into thinking they had found real gold. Pyrite produces sparks when struck against metal or flint.
Field identification & locations
Identify by metallic luster, brassy yellow color, hardness higher than real gold (gold is soft around 2.5-3), and dark greenish-black streak. Common in Spain, Peru, USA, Russia, and Italy.
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