mineral
Pyrite Geode
Iron Disulfide (FeS2)
Hardness: 6-6.5 on Mohs scale; Color: Brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 4.9-5.2.
- Hardness
- 6-6
- Color
- Brass-yellow
- Luster
- Metallic
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Physical properties
Hardness: 6-6.5 on Mohs scale; Color: Brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 4.9-5.2.
Formation & geological history
Formed through hydrothermal precipitation or in sedimentary environments with oxygen-depleted organic material. These specific geodes often form in shale or limestone cavities.
Uses & applications
Primarily used as a minor source of sulfur and iron, in jewelry as marcasite, and as a popular collector's specimen.
Geological facts
Often called 'Fool's Gold' because its color resembles gold, though it is much harder and lacks gold's malleability. Known for forming perfect cubic crystals naturally.
Field identification & locations
Identify by its metallic luster, golden color, and green-black streak on a porcelain plate. Common in locations like Peru, Spain, and the US (e.g., Colorado, Illinois).
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