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Aragonite and calcite are polymorphs—minerals identical in chemical composition but differing slightly in their crystal lattice arrangement
Halisaurus may not have dominated the seas by size
the lake spanned nearly 930 square miles
making it a superstar among collectors
1.7" Mosasaur Hoffmanni Fossil Tooth In Matrix Cretaceous Dinosaur Era COA Goulmimichthys Aragonite and calcite are polymorphs—mineralsLocation: Oued Zem, Morocco Weight: 5. 4 Ounces Dimensions: 3. 2 Inches Long, 2. 5 Inches Wide, 1. 7 Inches Thick (Matrix) Tooth Dimensions: 1. 7 Inches Long, 0. 5 Inches Wide. Comes with a Certificate of Authenticity. The item pictured is the one you will receive. 100 66 Million Years old, Upper Cretaceous, Maastrichtian Epoch. Name: Mosasaurus Hoffmanni Named By: Mantelli 1889. Diet: Carnivore. Size: Depending upon the species, Prognathodon could