mineral
Pyrite (Fools Gold)
Iron Disulfide (FeS2)
Hardness: 6-6.5 Mohs, Color: Brass-yellow or gray-gold, Luster: Metallic, Crystal Structure: Isometric (cubic), Cleavage: Poor, Specific Gravity: 4.9-5.2
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 Mohs, Color: Brass-yellow or gray-gold, Luster: Metallic, Crystal Structure: Isometric (cubic), Cleavage: Poor, Specific Gravity: 4.9-5.2
Formation & geological history
Formed in diverse environments including hydrothermal veins, sedimentary rocks under reducing conditions, and as an accessory mineral in igneous rocks via sulfide segregation.
Uses & applications
Primary source of sulfur and sulfuric acid; historical use in ignition (wheel-lock guns); widely used in costume jewelry and collector specimens.
Geological facts
Pyrite is nicknamed Fools Gold due to its visual similarity to real gold, though it is harder and more brittle. When struck against steel it produces sparks.
Field identification & locations
Identify by its cubic crystal habit and brassy luster. It will leave a greenish-black streak on a porcelain plate, unlike real gold which leaves a yellow streak.
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metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
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