Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Na^+$	Sodium cation	element	1		constituent cation	main
	$Ca^{2+}$	Calcium cation	element	1		constituent cation	main
	$B$	Boron	element	5		constituent element	main
	$O$	Oxygen	element	6		constituent element	main
	$(OH)^-$	Hydroxide anion	chemical function	6		anionic radical	main
	$H_2O$	Water	molecule	5		hydration	main

Chemical functions

	Function	Number
	$(OH)^-$	6
	$R-OH$	2

Chemical bonds

	Bond	Number
	$>B-O-$	6
	$\geq B-O-$	12
	$-O-H$	2
	$O^--H$	1

Oxides

Formula	$Na_{2}O$	$CaO$	$B_{2}O_{3}$	$H_{2}O$
Mass fraction (%)	7.65	13.84	42.95	35.57

Strunz

Class

borates (06)

Division

pentaborates (06.E)

Family

Neso-pentaborates (06.EA)

Code

06.EA.25

Dana

Major class

carbonates, nitrates, borates (V)

Class

hydrated borates containing hydroxyl or halogen (26)

Type

26.05

Group

-Ulexite- group (26.05.11)

Code

26.05.11.01

Phase type

crystalline

Crystal system

triclinic

Crystal class

pinacoidal

Crystal class symbol

-1 (Ci)

Crystal spacegroup

P-1

Refringence type

biaxial

Refringence sign

positive

Birefringence

0.030

Refraction index $n_{\alpha}$

1.49

Refraction index $n_{\beta}$

1.51

Refraction index $n_{\gamma}$

1.52

Dispersion V

none

Pure color

colorless

Color

colorless, white

Diaphaneity

translucent

Luster

vitreous

Links

• MinDAT: Ulexite
• WebMineral: Ulexite
• Wikipedia: Ulexite