calcareous

from WordNet (r) 3.0 (2006)

calcareous
    adj 1: composed of or containing or resembling calcium carbonate
           or calcite or chalk [syn: {calcareous}, {chalky}]

from The Collaborative International Dictionary of English v.0.48

Calcareous \Cal*ca"re*ous\, a. [L. calcarius pertaining to lime.
   See {Calx}.]
   Partaking of the nature of calcite or calcium carbonate;
   consisting of, or containing, calcium carbonate or carbonate
   of lime.
   [1913 Webster]

   {Calcareous spar}. See as {Calcite}.
      [1913 Webster]