Constituent
Name
Eitelite
IMA name
Eitelite
Class
non-silicate mineral
Compound type
carbonate
Chemical composition
Formula
Na2Mg(CO3)2
Chemical formula
Na2Mg(CO3)2
Elemental formula
(Na+)2 (Mg2+) C2 (O-)6
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
Na⁺ Sodium cation element 2 constituent cation main
Mg2+ Magnesium(II) cation element 1 constituent cation main
(CO3)2- Carbonate anion chemical function 2 anionic radical main
Chemical functions
  Function Number
(CO3)2- 2
Chemical bonds
  Bond Number
· Mg2+ · O-- 2
……C…O-2/3 3
Na⁺ · O-- 2
Oxides
Formula Na2O MgO CO2
Mass fraction (%) 32.57 21.18 46.25

Strunz

Class
carbonates - nitrates (05)
Division
carbonates without additional anions, without H2O (05.A)
Family
Alkali and alkali-earth carbonates (05.AC)
Code
05.AC.05

Dana

Major class
carbonates, nitrates, borates (V)
Class
anhydrous carbonates (14)
Type
with Compound Formula A+2B++(CO3)2 (14.03)
Group
-Eitelite- group (14.03.02)
Code
14.03.02.01
Phase type
crystalline
Crystal system
trigonal
Crystal class
rhombohedral
Crystal class symbol
-3 (S6)
Crystal spacegroup
R-3
Molar mass
190.30 g/mol
Density
2.737 g/cm3
Refringence type
uniaxial
Refringence sign
negative
Birefringence
0.1550
Refraction index nα
1.6052
Refraction index nβ
1.4502
Color
colorless, white
Diaphaneity
transparent
Luster
vitreous