mineral
Pyrite Sun
Iron Sulfide (FeS2)
AI-generated identification · may be incorrectHardness 6-6.5 on Mohs scale, metallic brass-yellow color, brilliant metallic luster, isometric crystal system, specific gravity 4.8-5.0.
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Physical properties
Hardness 6-6.5 on Mohs scale, metallic brass-yellow color, brilliant metallic luster, isometric crystal system, specific gravity 4.8-5.0.
Formation & geological history
Formed in carbonaceous shales and coal beds through low-temperature chemical precipitation, often millions of years old.
Uses & applications
Used primarily as a mineral specimen for collectors, in jewelry, and historically as a source of sulfur and iron.
Geological facts
Also known as pyrite dollars or pyrite suns, these radial aggregates form exclusively within coal seams in Illinois.
Field identification & locations
Easily identified by its distinctive disk shape, radiating crystal structure, and bright metallic brassy sheen.
