one of the commonest minerals, calcium carbonate, CaCO3, found in a great variety of crystalline forms: a major constituent of limestone, marble, and chalk; calc-spar.
cal·cite (kāl'sīt') n. A common crystalline form of natural calcium carbonate, CaCO3, that is the basic constituent of limestone, marble, and chalk. Also called calcspar. cal·cit'ic (-sĭt'ĭk) adj.
Main Entry: cal·cite Pronunciation: 'kal-"sIt Function: noun : a mineral CaCO3 consisting of calcium carbonate crystallized in hexagonalform and including common limestone, chalk, and marble —cal·cit·ic/kal-'sit-ik/adjective