【化】 白云石

[ noun ]
a light colored mineral consisting of calcium magnesium carbonate; a source of magnesium; used as a ceramic and as fertilizer
<noun.substance>

Bitter spar \Bit"ter spar"\
A common name of dolomite; -- so called because it contains
magnesia, the soluble salts of which are bitter. See
{Dolomite}.

dolomite \dol"o*mite\ (d[o^]l"[-o]*m[imac]t), 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}.