IMA Code

Nah

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Na^+$	Sodium cation	element	1		constituent cation	main
	$(HCO_3)^{-}$	Bicarbonate anion	chemical function	1		anionic radical	main

Chemical functions

	Function	Number
	$(HCO_3)^{-}$	1

Chemical bonds

	Bond	Number
	$Na^+ \cdot O^{-}-$	1
	$\dddot - C \dddot - O^{-1/2}$	2
	$\dddot - \dddot - C-O$	1
	$-O-H$	1

Oxides

Formula	$Na_{2}O$	$H_{2}O$	$CO_{2}$
Mass fraction (%)	36.89	10.72	52.39

Strunz

Class

carbonates - nitrates (05)

Division

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

Family

Alkali carbonates (05.AA)

Code

05.AA.15

Dana

Major class

carbonates, nitrates, borates (V)

Class

acid carbonates (13)

Type

with miscellaneous formulae (13.01)

Group

-Nahcolite- group (13.01.01)

Code

13.01.01.01

Phase type

crystalline

Crystal system

monoclinic

Crystal class

prismatic

Crystal class symbol

2/m (C2h)

Crystal spacegroup

P2(1)/c

Refringence type

biaxial

Refringence sign

negative

Birefringence

0.206

Refraction index $n_{\alpha}$

1.377

Refraction index $n_{\beta}$

1.503

Refraction index $n_{\gamma}$

1.583

Pure color

colorless

Color

colorless, white, gray, brown, black

Diaphaneity

transparent to translucent

Luster

vitreous

Links

• MinDAT: Nahcolite
• WebMineral: Nahcolite
• Wikipedia: Nahcolite