beta Dipotassium calcium carbonate | SSHADE

Solid phase

Official name: beta Dipotassium calcium carbonate

Name and identifiers

Secondary names: K2Ca(CO3)2

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 and bonds

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)

Endmembers and polymorphs

Polymorphs

alpha Dipotassium calcium carbonate

Associated phases

Equivalent mineral: Fairchildite

Crystallography

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

Physical properties

Molar mass: 206.08 $g/mol$
Density: 2.45 (calc.) $g/cm^3$

Thermodynamical properties

State NTP: solid

Optical properties

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

Links and Publications

Links

MinDAT: Fairchildite