Rhodochrosite

Rhodochrosite
Chemical name	Manganese carbonate
Chemical formula	MnCO3
Identification
Colors	Pink, rose-red, dark-red, brown
Crystal habit	Most often in rhombohedrons
Crystal system	Hexagonal
Cleavage	Perfect in three directions, forming a rhombohedron
Fracture	Uneven, brittle
Hardness	3½ - 4
Luster	Vitreous, pearly
Specific gravity	3.4 to 3.6
Streak	White

Chesterman, pp. 435–436

Sources

• Chesterman, Charles W. The Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf: New York (1987)