Mineral Name
Chemical Formula
CaMg(CO3)2
Preview
Color
white, gray, reddish-white, brownish-white
Class
Article
Luster
vitreous (glassy)
Diaphaneity
transparent to translucent
Hardness
3.5-4
Cleavage
3 directions: {1011} perfect, {1011} perfect, {1011} perfect
Fracture
brittle - conchoidal
Density
2.8-2.9
Crystal Shape
crystals are usually rhombohedral. Faces can be curved, some so as to form 'saddle-shaped' crystals. Can form in coarse, granular, masses.
Crystal System
Hexagonal
COinS
Comments
Will react slowly upon contact with dilute HCl. Will effervesce more readily only in hot HCl or by powdering the mineral.