Solid phase
Official name
beta Dipotassium calcium carbonate
Secondary names
K2Ca(CO3)2
Type
Family
ionic solid
Class
normal salt
Compound type
carbonate
Chemical composition
Formula
$K^+_2Ca^{2+} \cdot (CO_3^{2-})_2$
Chemical formula
K2Ca(CO3)2
Elemental formula
(K+)2 (Ca2+) C2 (O-)6
Isotope mixture type
terrestrial abundance
10.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$K^+$ Potassium(1+) cation element 2 0.4 1 constituent cation main
$Ca^{2+}$ Calcium cation element 1 0.2 1 constituent cation main
$(CO_3)^{2-}$ Carbonate anion chemical function 2 0.4 1 anionic radical main
Chemical functions
  Function Number
$(CO_3)^{2-}$ 2
Chemical bonds
  Bond Number
$K^+ \cdot O^{-}-$ 2
$\cdot Ca^{2+} \cdot O^{-}-$ 2
$\dddot - \dddot - C \dddot - O^{-2/3}$ 3
Class
normal salts (07)
Type
double normal salts (07.02)
Polymorphs
Equivalent mineral
Fairchildite
Phase name
$\beta-K_2Ca(CO_3)_2$
Phase type
crystalline
Crystal system
hexagonal
Crystal class
dihexagonal-dipyramidal
Crystal class symbol
6/mmm (D6h)
Crystal spacegroup
P6(3)/mmc
Molar mass
206.08 $g/mol$
Density
2.45 (calc.) $g/cm^3$
State NTP
solid
Refringence type
uniaxial
Refringence sign
negative
Birefringence
0.1035
Refraction index $n_{\alpha}$
1.533
Refraction index $n_{\beta}$
1.498
Pure color
colorless
Color
colorless, white
Diaphaneity
translucent
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