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: 4.8-5.0
- 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: 4.8-5.0
Formation & geological history
Formed in hydrothermal veins, as an accessory mineral in igneous rocks, and by precipitation in sedimentary environments with low oxygen. Found across various geological ages.
Uses & applications
Historically used as a source of sulfur and sulfuric acid. Today, used in lithium batteries, as a semiconductor material, and as collector specimens and jewelry.
Geological facts
Pyrite gets its name from the Greek 'pyros' meaning fire, because it produces sparks when struck against metal or stone. It's often mistaken for gold due to its metallic luster.
Field identification & locations
Identify by its brassy color, cubic crystal habit, and greenish-black streak (unlike real gold). Commonly found in quartz veins and coal beds worldwide.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous