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 (%)	21.66	15.38	62.96

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.10

Dana

Major class

carbonates, nitrates, borates (V)

Class

hydrated carbonates (15)

Type

where A+(XO3)·x(H2O) (15.01)

Group

-Natron- group (15.01.02)

Code

15.01.02.01

Phase type

crystalline

Crystal system

monoclinic

Crystal class

prismatic

Crystal class symbol

2/m (C2h)

Crystal spacegroup

P2/m

Comments

also class domatic m (Cs), space group Cc

Texture

polycrystalline

Molar mass

286.14 $g/mol$

Density

1.478 $g/cm^3$

Refringence type

biaxial

Refringence sign

negative

Birefringence

0.035

Refraction index $n_{\alpha}$

1.405

Refraction index $n_{\beta}$

1.425

Refraction index $n_{\gamma}$

1.44

Dispersion V

r > v

Color

colorless, white, gray, yellow

Diaphaneity

transparent to translucent

Luster

vitreous