Class

non-silicate mineral

Compound type

carbonate

Chemical functions

	Function	Number
	$(CO_3)^{2-}$	1

Chemical bonds

	Bond	Number
	$\dddot - \dddot - C \dddot - O^{-2/3}$	3

Oxides

Formula	$Na_{2}O$	$CO_{2}$	$H_{2}O$
Mass fraction (%)	49.98	35.49	14.53

Strunz

Class

carbonates - nitrates (05)

Division

carbonates without additional anions, with H2O (05.C)

Family

with large cations (alkali and alkali-earth carbonates) (05.CB)

Code

05.CB.05

Dana

Major class

carbonates, nitrates, borates (V)

Class

hydrated carbonates (15)

Type

where A+(XO3)·x(H2O) (15.01)

Group

-Thermonatrite- group (15.01.01)

Code

15.01.01.01

Phase type

crystalline

Crystal system

orthorhombic

Crystal class

dipyramidal

Crystal class symbol

mmm (D2h)

Crystal spacegroup

Pmmm

Comments

also class pyramidal mm2 (C2v), space group Pca21

Molar mass

124.00 $g/mol$

Density

2.255 $g/cm^3$

Refringence type

biaxial

Refringence sign

negative

Birefringence

0.104

Refraction index $n_{\alpha}$

1.420

Refraction index $n_{\beta}$

1.506

Refraction index $n_{\gamma}$

1.524

Dispersion V

relatively strong

Color

colorless, white, gray, yellow

Diaphaneity

transparent

Luster

vitreous