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to indigo blue
where the Co2+ (Cobalt) replaces some of the Calcium
creating a beautiful mosaic pattern
making larger pairs of this quality rare
You can see the original ridge-line / keel of the Ammonite and observe large portions of the shell on either side
Pyrite Sun Rainbow to indigo blueWhether you call them Pyrite Suns or Pyrite Dollars, these interesting mineral formations look like mineralized sand dollars! A unique crystal formation, the Pyrite actually formed as a concretion approximately 300 million years ago. As the Pyrite was compressed between layers of shale, it was unable to grow vertically outward, and was forced to grow in a lateral or radial pattern. This created the fun disc shape these specimens from Sparta, Illinois
US$ 89.42
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