D defs.my
Entry 1 sense Webster, 1913

dolomite

/(dŏl"ō̇*mīt)/ · dol·o·mite · IPA /ˈdoʊ.ləˌmaɪt/
01 n. A mineral consisting of the carbonate of lime and magnesia in varying proportions. It occurs in distinct crystals, and in extensive beds as…
  1. 1.
    A mineral consisting of the carbonate of lime and magnesia in varying proportions. It occurs in distinct crystals, and in extensive beds as a compact limestone, often crystalline granular, either white or clouded. It includes much of the common white marble. Also called bitter spar.(Geol. & Min.) Also: bitter spar