mineral
Pyrite
Iron Sulfide (FeS2)
Hardness: 6-6.5 (Mohs), Color: Brass-yellow, Luster: Metallic, Crystal Structure: Isometric/Cubic, Cleavage: Indistinct, Streak: Greenish-black
- Hardness
- 6-6
- Streak
- Greenish-black
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Physical properties
Hardness: 6-6.5 (Mohs), Color: Brass-yellow, Luster: Metallic, Crystal Structure: Isometric/Cubic, Cleavage: Indistinct, Streak: Greenish-black
Formation & geological history
Formed in hydrothermal veins, by magmatic segregation, or as an authigenic mineral in sedimentary rocks. Often found in Arkansas sedimentary sequences.
Uses & applications
Historical source of sulfur, used in sulfuric acid production, and popular as a collector specimen and in jewelry.
Geological facts
Often called 'Fool's Gold' because of its metallic luster and pale brass-yellow hue. It can cause 'pyrite disease' where it oxidizes and decays in humid museum environments.
Field identification & locations
Identify by its hardness (scratches glass, unlike gold) and its brittle nature. Common in the sedimentary beds of the Gulf Coastal Plain region where it replaced organic matter.
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sedimentary
Schist
Schist
Metamorphic
Epidote
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metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
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Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous