Manganese Carbonate
MnCO3
|
Chemical name
Manganese Carbonate |
|
Mineral name
Rhodochrosite |
|
Chemical formula
MnCO3 |
|
Melting point [°C]
>200 |
|
Crystal system
trigonal |
|
Crystal Class
ditrigonal-scalenohedral (-3 2/m) |
|
Space Group
R-3c |
|
Unit cell
a [Å]:4.74 b [Å]:4.74 c [Å]:15.51 |
|
Molecular weight [g/mol]
114.95 |
|
Formula units
Z=6 |
|
Twinning
on {01-12} (contact and lamellar) |
|
Mohs hardness
3.5 - 4.5 |
|
Density [g/cm3]
3.3 - 3.6 |
|
Cleavage
perfect on {10-11} |
|
Fracture / Tenacity
conchoidal |
|
Color
pink to rose-red, cherry-red, yellow to yellowish gray, brown |
|
Streak
white |
|
Transparency
transparent to translucent |
|
Luster
vitreous to pearly |
|
Optical character
uniaxial (-) |
|
Refractive Index
nω=1.814-1.816; nε=1.596 |
|
Birefringence δ
0.218 |
|
Pleochroism δ
weak |
