Constituent
Name
$K_2Ca(CO_3)_2$ - phase alpha
Official name
alpha Dipotassium calcium carbonate
Family
ionic solid
Class
normal salt
Compound type
carbonate
Chemical composition
Formula
K⁺2Ca2+ · (CO32-)2
Chemical formula
K2Ca(CO3)2
Elemental formula
(K+)2 (Ca2+) C2 (O-)6
Isotope mixture type
terrestrial abundance
  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
Ca2+ Calcium cation element 1 0.2 1 constituent cation main
(CO3)2- Carbonate anion chemical function 2 0.4 1 anionic radical main
Chemical functions
  Function Number
(CO3)2- 2
Chemical bonds
  Bond Number
· Ca2+ · O-- 2
K⁺ · O-- 2
……C…O-2/3 3
Class
normal salts (07)
Type
double normal salts (07.02)
Phase name
α-K2Ca(CO3)2
Phase type
crystalline
Crystal system
trigonal
Crystal class
ditrigonal-scalenohedral
Crystal class symbol
-3m (D3d)
Crystal spacegroup
R-3m
Molar mass
206.08 g/mol
Density
2.49 g/cm3
Refringence type
uniaxial
Refringence sign
unknown
Birefringence
0.140
Refraction index nα
1.595
Refraction index nβ
1.455
Color
colorless, white
Diaphaneity
translucent