mineral
Pyrite
Iron Disulfide (FeS2)
Hardness: 6-6.5 (Mohs), Color: Pale brass-yellow, Luster: Metallic, Crystal Structure: Isometric (cubic or pyritohedral), 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 or pyritohedral), Cleavage: Indistinct, Specific Gravity: 4.9-5.2.
Formation & geological history
Forms in diverse environments including magmatic segregation, hydrothermal veins, and sedimentary rocks through the reaction of sulfur with iron-bearing minerals.
Uses & applications
Historically used as a source of sulfur and sulfuric acid; today used in lithium batteries, as a flux in glass manufacturing, and as ornamental 'marcasite' jewelry.
Geological facts
Widely known as 'Fool's Gold' because its color resembles real gold, though it is much harder and more brittle. It can create sparks when struck against steel.
Field identification & locations
Identify by its 'brassy' yellow color and cubic crystal habits; unlike gold, it is brittle and will crush into powder rather than flatten. Common in Peru, Spain, and Italy.
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
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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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