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A variety of sizes in the Quartz and Amethyst crystals catches the eye from a variety of angles
Empty voids within the coral were naturally replaced with silica-rich mineralization in the form of Quartz crystals and Chalcedony
this Copper features spinel law crystal twins both front and back
making larger pairs of this quality rare
where the Co2+ (Cobalt) replaces some of the Calcium
Pyrite Sun Rainbow A variety of sizes inWhether 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
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