22196 - Calcite Geode with Gypsum Crystal 680 g in Natural Matrix Sphenopteris This partial maxillary was broken

This partial maxillary was broken in some sectors during the initial collecting efforts but all parts were put back together

Otarion diffractum

†Acanthoceras sp

They come from the famous sites of the Judith River Formation in Montana (Campanian stage

Unique plate handmade in the south of morocco

22196 - Calcite Geode with Gypsum Crystal 680 g in Natural Matrix Sphenopteris This partial maxillary was brokenSIZE: 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