Calcite

n.

1.

(Min.) 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.

Noun

1.

calcite - a common mineral consisting of crystallized calcium carbonate; a major constituent of limestone

alabaster, calcium carbonate, chalk, Iceland spar, limestone, Mexican onyx, onyx marble, oriental alabaster, spar