Constituent
Name
Dolomite
Class
non-silicate mineral
Compound type
carbonate
Relevance
impurity
Arrangement
coated core
Mass fraction
2e-05 $\pm$ 2e-05
Abundance comments
Mass fraction uncertain (0.002 for < 2µm size Swy-2 - Vogt 2002)
Formula
$CaMg(CO_3)_2$
Chemical formula
CaMg(CO3)2
Elemental formula
Mg O6 Ca C2
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$C$ Carbon element 2 constituent element main
$Ca$ Calcium element 1 constituent element main
$O$ Oxygen element 6 constituent element main
$Mg$ Magnesium element 1 constituent element main
Chemical functions
  Function Number
$\bullet(CO_3)^{2-}$ 2
Chemical bonds
  Bond Number
$>C=O$ 1
$\eqslantgtr C-O^-$ 2
Oxides
Formula $CaO$ $CO_{2}$ $MgO$
Mass fraction (%) 30.41 47.73 21.86

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.10

Dana

Major class
carbonates, nitrates, borates (V)
Class
anhydrous carbonates (14)
Type
with compound formula A+B++(CO3)2 (14.02)
Group
Dolomite group (Trigonal: R-3) (14.02.01)
Code
14.02.01.01
Phase type
crystalline
Crystal system
trigonal
Crystal class
rhombohedral
Crystal class symbol
-3 (S6)
Crystal spacegroup
R-3
Molar mass
184.40 $g/mol$
Density
2.8 - 2.9 $g/cm^3$
Refringence type
uniaxial
Refringence sign
negatif
Birefringence
0.179 - 0.181
Refraction index $n_{\alpha}$
1.50
Refraction index $n_{\beta}$
1.679-1.681
Color
white, gray, reddish white, brownish white
Diaphaneity
transparent to translucent
Luster
vitreous