mineral
Pyrite
Iron Sulfide (FeS2)
Hardness: 6-6.5 on Mohs scale; Color: brass-yellow; Luster: metallic; Crystal structure: isometric/cubic; Cleavage: indistinct; Specific gravity: 4.9-5.2
- Hardness
- 6-6
- Color
- brass-yellow
- Luster
- metallic
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Physical properties
Hardness: 6-6.5 on Mohs scale; Color: brass-yellow; Luster: metallic; Crystal structure: isometric/cubic; Cleavage: indistinct; Specific gravity: 4.9-5.2
Formation & geological history
Forms in diverse environments including hydrothermal veins, sedimentary rocks (as concretions), and as an accessory mineral in igneous and metamorphic rocks across all geological ages.
Uses & applications
Primarily used in the production of sulfuric acid for industry. Historically used to create sparks for firearms (wheellock) and as a gemstone during the Victorian Era.
Geological facts
Commonly known as Fool's Gold because its color and metallic luster often led prospectors to mistake it for real gold. Unlike gold, pyrite is brittle and leaves a greenish-black streak.
Field identification & locations
Identify by its cubic crystal habit, brassy color, and high hardness (it can scratch glass). It frequently occurs in coal seams and shale deposits globally.
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