Pyrite Sun

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Pyrite Sun (or pyrite dollar). This pyrite sun formed between tightly spaced layers of slate interbedded in 300 million-year-old Pennsylvanian Period coal deposits. Under pressure, growth was forced in a laterally compressed, radiating manner (under normal conditions, pyrite would form cubes or pyritohedrons). Pyrite is iron sulfide--its presence is what makes coal high in sulfur. Sparta, Illinois, USA
Pyrite Sun (or pyrite dollar). This pyrite sun formed between tightly spaced layers of slate interbedded in 300 million-year-old Pennsylvanian Period coal deposits. Under pressure, growth was forced in a laterally compressed, radiating manner (under normal conditions, pyrite would form cubes or pyritohedrons). Pyrite is iron sulfide--its presence is what makes coal high in sulfur. Sparta, Illinois, USA
Filename: Pyrite_Sun.jpg
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