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Flexycalymene Trilobite Geodes are approx
Pure fluorite is clear
These pieces of cuboidal fluorite crystals in varying shades of dark green occur on a high contrast white-gray matrix
highly variable Chalcedony spheres are almost geode-like in appearance and one can clearly see the process of geode or agate formation in progress in each specimen
from the middle Miocene around 12-16 million years ago
Fish Fossil - Knightia Eoceana Iceland Spar Flexycalymene Trilobite Geodes are approxDuring the Eocene, 40 50 million years ago, vast shoals of freshwater fish inhabited a large shallow inland sea across the American West. The herring like fish of the genus Knightia were far and away the most abundant freshwater fish during this era, and because of this they are one of the most frequently found vertebrate fossils on earth. Originating from the famed Green River Formation in Wyoming, fossils of Knightia eocaena and their close
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