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COQUINA Coquina is a sedimentary rock of biochemical origin. It is formed when corals and seashells are consolidated into a rock. The component shells and corals retain much of their shape, and are generally poorly cemented. Coquina is mostly calcite, although other shell forming minerals are also present. Coquina was once used as a building material, although the artificial material of the same name consists of concrete stucco in which peices of sea shells are pressed.
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