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The size of this fragment of Onchopristis rostral bone is probably only about a third of its original length
Its preservation is exceptional
Crystals of brochantite can range from emerald green to black-green to blue-green
Beautiful tooth of this rare durophagous fish
20799 - Top Beautiful Huge 6.30 Inch Calcite Crystals from South Morocco - New Location Bismuth The size of this fragmentHuge and sharp crystals of calcite from a new location unpublished in the mountains of the Erich region, Morocco.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