mineral
Pyrite
Iron Sulfide (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 diverse environments including magmatic segregation, hydrothermal veins, and sedimentary deposits under anaerobic conditions. It is found in rocks of all geological ages.
Uses & applications
Commercial source of sulfur and sulfuric acid; used in jewelry (marcasite jewelry), as a gemstone in healing circles, and as an igniter in firearms historically.
Geological facts
Often called 'Fool's Gold' because its color and look are similar to gold. Unlike gold, pyrite is brittle and will shatter if struck, rather than flattening. It can create sparks when struck against steel.
Field identification & locations
Identify in the field by its brassy color, metallic luster, and blackish-green streak. It is commonly found globally in association with quartz, coal veins, and metamorphic rocks.
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
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Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
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Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
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