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20803 Top Beautiful Huge 3.46 Inch Calcite Crystals from South Morocco New Location Orthoceras It is a tooth from It is a tooth from an enormous shark species Palaeocarcharodon orientalis (Pygmy White Shark) Patomaspis Huge and sharp crystals of calcite from a new location unpublished in the mountains of the Erich region Aragonite will change to calcite over timescales of days or less at temperatures exceeding 300 °C and vaterite is even less stable
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