mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Hardness: 6-6.5 (Mohs), Color: Pale brass-yellow, Luster: Metallic, Crystal Structure: Isometric/Cubic, Cleavage: Indistinct, Specific Gravity: 4.9-5.2
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 (Mohs), Color: Pale brass-yellow, Luster: Metallic, Crystal Structure: Isometric/Cubic, Cleavage: Indistinct, Specific Gravity: 4.9-5.2
Formation & geological history
Formed in diverse geological settings through hydrothermal veins, metamorphic rocks, and sedimentary environments under reducing conditions. It is found in rocks of all ages.
Uses & applications
Historically a source of sulfur and sulfuric acid. Today used in lithium batteries, as a semiconductor material, and widely sold as jewelry (marcasite) and collector specimens.
Geological facts
The nickname 'Fool's Gold' comes from its resemblance to precious gold, though it is much harder and more brittle. It is the most common sulfide mineral on Earth's surface.
Field identification & locations
Identify in the field by its cubic crystal habit, brassy color, and greenish-black streak. Unlike gold, it cannot be scratched by a knife and will shatter rather than flatten.
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Metamorphic
Epidote
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metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous