09133 - Top Beautiful Huge 7.80 Inch Calcite Crystals from South Morocco Basseiarges Carroll 1988

Carroll 1988

Tissint        29°28

many of the spines during the preparation process have been fractured and glued again

SYSTEMATIC PALEONTOLOGY

Cyrtoproetus

09133 - Top Beautiful Huge 7.80 Inch Calcite Crystals from South Morocco Basseiarges Carroll 1988Huge and sharp crystals of calcite from a new location unpublished in the mountains of the Erich region, Morocco.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