Manganese Carbonate, MnCO3
Crystal System: Hexagonal
- Rhodochrosite is a member of the calcite group. It occurs as a common gangue mineral in
sufide mineral deposits and hydrothermal veins containing ores of copper, lead and
silver. It is formed under a wide range of temperatures. Rhodochrosite also occurs as a
secondary mineral in iron and manganese oxide deposits. It is also associated with
metamorphic and metasomatic rocks of sedimentary origin.
- Rhodochrosite most commonly occurs as granular, mammillated, concretionary, reniform and
stalactic masses. More rarely it is found as rhombohedral crystals which vary from brown
to light grey to translucent pink crystals with a vitreous to pearly luster. When
exposed to air, rhodochrosite can become covered with a dark film of manganese oxide.
Rocks from Ron Zeilstra's Collection
Index of Specimen Images
Table of Contents