mineral
Pyrite
Iron Disulfide (FeS2)
AI-generated identification · may be incorrectHardness: 6-6.5; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Indistinct; Specific Gravity: 4.8-5.0
- Hardness
- 6-6
- Color
- Pale brass-yellow
- Luster
- Metallic
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Physical properties
Hardness: 6-6.5; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Indistinct; Specific Gravity: 4.8-5.0
Formation & geological history
Formed in hydrothermal veins, by magmatic segregation, or as an authigenic mineral in sedimentary rocks and metamorphic environments. Found across all geological ages.
Uses & applications
Historically used for sulfur and sulfuric acid production. Today it is used in jewelry (as marcasite), in paper making, and is a popular collector's mineral.
Geological facts
Often called 'Fool's Gold' because its color and high specific gravity confuse it with real gold. Unlike gold, it is brittle and leaves a greenish-black streak.
Field identification & locations
Identify by its brassy color, cubic crystal habit, and hardness (it scratches copper but gold won't). Common in Peru, Spain, and North America.
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
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Granite
Granite (Phaneritic intrusive igneous rock)
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