Calcite n. : Calcium carbonate, or carbonate of lime. It is rhombohedral in its crystallization, and thus distinguished from aragonite. It includes common limestone, chalk, and marble. Called also calc-spar and calcareous spar.

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Taxonomy
Calcite, calcite crystals, aragonite, calcite sea, Calcite group, mineral, calcium carbonate, dissolution, free encyclopedia, the shells, precipitation, rock, Earth history, mindat, carbonate mineral, rhombohedral, fracture, conchoidal.

Defination from the web:
Calcite, like most carbonates, will dissolve with most forms of acid. Calcite can be either dissolved by groundwater or precipitated by groundwater, depending on several factors including the water temperature, pH, ...