Source : Webster's Revised Unabridged Dictionary (1913)

Chalky \Chalk"y\, a.
   Consisting of, or resembling, chalk; containing chalk; as, a
   chalky cliff; a chalky taste.

Source : WordNet®

chalky
     adj 1: composed of or containing or resembling calcium carbonate or
            calcite or chalk [syn: {calcareous}]
     2: having the color of chalk; "she turned chalky white"