mineral
Pyrite Sun
Iron Sulfide (FeS2)
Hardness of 6-6.5 on the Mohs scale, brass-yellow to pale bronze color with a metallic luster, radiating crystal structure resembling a sunburst or disc, no distinct cleavage, specific gravity of 4.8-5.0.
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Physical properties
Hardness of 6-6.5 on the Mohs scale, brass-yellow to pale bronze color with a metallic luster, radiating crystal structure resembling a sunburst or disc, no distinct cleavage, specific gravity of 4.8-5.0.
Formation & geological history
Formed in carbonaceous shales and coal beds through low-temperature hydrothermal activity and chemical precipitation in reducing environments, millions of years ago.
Uses & applications
Primarily collected as unique mineral specimens and display pieces; historically used for producing sparks to start fires and as an ore of sulfur and iron.
Geological facts
Pyrite suns are also known as pyrite dollars or pyrite biscuits. They form specifically within the Illinois coal measures and are famous for their delicate, radiating crystalline structures.
Field identification & locations
Easily identified by their metallic brassy luster, sunburst radiating pattern, and disk-like shape. Commonly found in coal mines and shales of southern Illinois and parts of Sparta, Illinois.
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