22115 - Top Beautiful Huge 3.17 Inch Calcite Crystals from South Morocco Morocco Chalcedonization is a variety of

Chalcedonization is a variety of silicification

They have an exceptional conservation

Alteration processes develop the rim of the sample

See also Kumar and Loyal 1987

22115 - Top Beautiful Huge 3.17 Inch Calcite Crystals from South Morocco Morocco Chalcedonization is a variety ofHuge and sharp crystals of calcite from a new location unpublished in the mountains of the Erich region, Morocco.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