\Dol"o*mite\, n. [After the French geologist Dolomieu.]
(Geol. & Min.)
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}.