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Calcite is a fascinating mineral. These calcite "cubes" are always a crowd pleaser to students that are amazed by the natural trigonal-rhombohedral cleavage. It is a dramatic demonstration of a distinct clevage pattern. Calcite also has a double-refraction optical quality that creates a double image of objects seen through it. (see second photo)Each is unique and contains naturally occuring fragmentation. Sold individually. Each crystal is about 2 cm x 2 cm x 4 cm.