Massive, 19.9" Calcite Crystal Formation - Morocco

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This is a massive cluster of large, scalenohedral calcite crystals that formed on a calcite encrusted matrix. This specimen was collected from the Atlas Mountains of Morocco. The largest calcite crystals are primarily golden in color, however they transition to grey in color along one edge due to impurities during formation.

The entire cluster measures 19.9" long by 14.5" wide by 8.2" tall when sitting on a flat surface. It weighs just over 73 lbs and the largest calcite crystal is twinned and measures 6" long.

Calcite, CaCO3, is a carbonate mineral and the most stable polymorph of calcium carbonate. The other polymorphs are the minerals aragonite and vaterite. Calcite crystals are trigonal-rhombohedral, though actual calcite rhombohedra are rare as natural crystals. However, they show a remarkable variety of habits including acute to obtuse rhombohedra, tabular forms, and prisms. Calcite exhibits several twinning types adding to the variety of observed forms. It may occur as fibrous, granular, lamellar, or compact. Cleavage is usually in three directions parallel to the rhombohedron form.
$695 $400
19.9 x 14.5 x 8.2". Weighs just over 73 lbs