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1: Aragonite
Aragonite is a form of Calcium Carbonate or limestone. At ordinary temperatures and pressures it changes to the more common calcite in as little as a few hours. Many shelled organisms use aragonite. When such an organism dies, the aragonite shell normally changes to calcite, but retains the characteristic needle shape of the aragonite crystals, which give the shell both lightness and great strength.

photo: USGS MII
public domain

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