Class

non-silicate mineral

Compound type

carbonate

Comments

Equivalent Space Group: Pmcn (62)

Chemical functions

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

Chemical bonds

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

Oxides

Formula	$Na_{2}O$	$CO_{2}$
Mass fraction (%)	58.48	41.52

Strunz

Class

carbonates - nitrates (05)

Division

carbonates without additional anions, without H2O (05.A)

Family

Alkali carbonates (05.AA)

Code

05.AA.10

Dana

Major class

carbonates, nitrates, borates (V)

Class

anhydrous carbonates (14)

Type

with simple formula A+CO3 (14.01)

Group

Natrite group (14.01.06)

Code

14.01.06.01

Phase type

crystalline

Crystal system

monoclinic

Crystal class

prismatic

Crystal class symbol

2/m (C2h)

Crystal spacegroup

C2/m

Molar mass

105.99 $g/mol$

Density

2.54 $g/cm^3$

Refringence type

biaxial

Refringence sign

negative

Birefringence

0.133

Refraction index $n_{\alpha}$

1.41

Refraction index $n_{\beta}$

1.535

Refraction index $n_{\gamma}$

1.543

Color

Colorless, Yellow orange, White, Pink

Diaphaneity

transparent

Luster

vitreous