S164 - Large Majungasaurus crenatissimus Abelisaurid Dinosaur Tooth with Unusual Green Sandstone matrix on its base Eocrinoids The Cobaltoan calcite is a

The Cobaltoan calcite is a variety of calcite containing Co2+ replacing Ca

Pyroxene crystals show complex zoning patterns

and 23 kg stones at the Maine Mineral and Gem Museum

4 short tons)

This is an exceptional rooted tooth of a Ichthyosaur (Platypterygius) from Stary Oskol

S164 - Large Majungasaurus crenatissimus Abelisaurid Dinosaur Tooth with Unusual Green Sandstone matrix on its base Eocrinoids The Cobaltoan calcite is aThis tooth is very special because it perfectly preserves the carina on both its distal and mesial edges. In addition, it is an exceptionally long tooth. It has no restorations or repairs of any kind. Only a small section of the tip is missing. Another very interesting aspect of this specimen is that its base is still filled with the natural sediment from the geological formation from which it came, revealing a striking green sandstone. This is quite