Constituent
Name
Magnesite
Class
non-silicate mineral
Compound type
carbonate
Relevance
main - major
Arrangement
single phase
Abundance comments
Possible traces
Formula
$MgCO_3$
Chemical formula
MgCO3
Elemental formula
Mg C O3
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Mg$ Magnesium element 1 constituent element main
$\bullet(CO_3)^{2-}$ Carbonate anion chemical function 1 anionic radical main
Chemical functions
  Function Number
$\bullet(CO_3)^{2-}$ 1
Chemical bonds
  Bond Number
$>C=O$ 1
$\eqslantgtr C-O^-$ 2
Oxides
Formula $MgO$ $CO_{2}$
Mass fraction (%) 47.8 52.2

Strunz

Class
carbonates - nitrates (05)
Division
carbonates without additional anions, without H2O (05.A)
Family
Alkali-earth (and other M2+) carbonates (05.AB)
Code
05.AB.05

Dana

Major class
carbonates, nitrates, borates (V)
Class
anhydrous carbonates (14)
Type
with simple formula A+CO3 (14.01)
Group
Calcite group (Trigonal: R-3c) (14.01.01)
Code
14.01.01.02
Phase type
crystalline
Crystal system
trigonal
Crystal class
hexagonal-scalenohedral
Crystal class symbol
-3m (D3d)
Crystal spacegroup
R-3c
Molar mass
84.31 $g/mol$
Density
3.00 $g/cm^3$
Refringence type
uniaxial
Refringence sign
negative
Birefringence
0.190 - 0.192
Refraction index $n_{\alpha}$
1.70
Refraction index $n_{\beta}$
1.508 - 1.510
Color
colorless, white, yellow, brown
Diaphaneity
transparent to translucent
Luster
vitreous