22107 - Top Beautiful Huge 9.57 Inch Calcite Crystals from South Morocco Onchopristis teeth collections Semi-quantitative EDS X-ray microanalysis was

Semi-quantitative EDS X-ray microanalysis was performed using EDS spot analysis with acquisition time 60s and maximum process time to achieve best resolu¬tion of peaks in spectra

Northwest Africa 11273 (NWA 11273)

Some of them have tiny glued and filled fractures

This huge and famous marine reptile is characterized by its long and stylized neck

8 mm  /  1

22107 - Top Beautiful Huge 9.57 Inch Calcite Crystals from South Morocco Onchopristis teeth collections Semi-quantitative EDS X-ray microanalysis wasHuge and sharp crystals of calcite from a new location unpublished in the mountains of the Erich region, Morocco. 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