- Nitrate of calcium, a substance having a grayish
white color, occuring in efforescences on old walls, and in limestone
caves, especially where there exists decaying animal matter.
- 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.