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8 mm / 1
with remarks on African Caudata" Tannina Alloul et al
Northwest Africa 11273 (NWA 11273)
which can collapse easily when even slight pressures are applied
22107 - Top Beautiful Huge 9.57 Inch Calcite Crystals from South Morocco Onchopristis teeth collections 8 mm / 1Huge and sharp crystals of calcite from a new location unpublished in the mountains of the Erich region, Morocco.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
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