22196 - Calcite Geode with Gypsum Crystal 680 g in Natural Matrix Sphenopteris Otarion diffractum
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Ships within 48 hours · Estimated delivery Sep 18 - Sep 23
Description
Otarion diffractum
This partial maxillary was broken in some sectors during the initial collecting efforts but all parts were put back together
Spectacular example of tooth belonging to an individual of Spinosaurus
Unique plate handmade in the south of morocco
Petrography: (A
22196 - Calcite Geode with Gypsum Crystal 680 g in Natural Matrix Sphenopteris Otarion diffractumSIZE: 142. 6 mm 5. 61 in WEIGHT: 680 g Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 3 as "calcite". Other polymorphs of calcium carbonate are the minerals aragonite and vaterite. Aragonite will change to calcite over timescales of days or less at temperatures exceeding 300 C and vaterite is even less stable. Gypsum is a
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