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calcite
Calcite is a carbonate mineral an the most stable polymorph of calcium carbonate (CaCO3). The other polymorphs are the minerals aragonite and vaterite. Aragonite will change to calcite at 470°C, and vaterite is even less stable.
Trivia about calcite
Also beginning with C-A, it's the one-word name for the form of calcium carbonate seen here as Iceland's spar