Magnesium Carbonate
MgCO3
Chemical name
Magnesium Carbonate
Mineral name
Magnesite
Chemical formula
MgCO3
Crystal system
trigonal
Crystal Class
ditrigonal-scalenohedral (-3 2/m)
Space Group
R-3c
Unit cell
a [Å]:4.59
b [Å]:4.59
c [Å]:14.87
Formula units
Z=6
Mohs hardness
3.5 - 4.5
Density [g/cm3]
~3.0
Cleavage
perfect on [10-11]
Fracture / Tenacity
conchoidal
Color
colorless, white, yellowish, brownish to black
Streak
white
Transparency
transparent to opaque
Optical character
uniaxial (-)
Refractive Index
nω=1.700; nε=1.509
Birefringence δ
0.191