Constituent Nobleite | SSHADE

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Constituent

Name: Nobleite
IMA name: Nobleite

Class: non-silicate mineral
Compound type: borate

Constituent abundance in material

Relevance: main - minor
Arrangement: in multi-phases
Mass fraction: 0.02 $\pm$ 0.2

Chemical composition

Formula: $CaB_6O_9(OH)_2 \bullet 3(H_2O)$
Chemical formula: CaB6O9(OH)2•3(H2O)
Elemental formula: (Ca2+) B6 O12 H8 (O-)2
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Ca^{2+}$	Calcium cation	element	1		constituent cation	main
	$B$	Boron	element	6		constituent element	main
	$O$	Oxygen	element	9		constituent element	main
	$(OH)^-$	Hydroxide anion	chemical function	2		anionic radical	main
	$H_2O$	Water	molecule	3		hydration	main

Chemical functions and bonds

Chemical functions

	Function	Number	Relevance
	$(OH)^-$	2
	$R-OH$	2	main

Chemical bonds

	Bond	Number	Relevance
	$>B-O-$	12
	$\geq B-O-$	8
	$-O-H$	2	main
	$O^--H$	1

Oxides composition

Oxides

Formula	$CaO$	$B_{2}O_{3}$	$H_{2}O$
Mass fraction (%)	16.64	61.98	21.38

Classifications

Strunz

Class: borates (06)
Division: hexaborates (06.F)
Family: Phyllo-hexaborates (06.FC)
Code: 06.FC.05

Dana

Major class: carbonates, nitrates, borates (V)
Class: hydrated borates containing hydroxyl or halogen (26)
Type: 26.06
Group: -Nobleite- group (26.06.06)
Code: 26.06.06.01

Phase type: crystalline

Crystallography

Crystal system: monoclinic
Crystal class: prismatic
Crystal class symbol: 2/m (C2h)
Crystal spacegroup: P2(1)/c

Physical properties

Molar mass: 336.99 $g/mol$
Density: 2.09 $g/cm^3$

Optical properties

Refringence type: biaxial
Refringence sign: positive
Birefringence: 0.054
Refraction index $n_{\alpha}$: 1.5
Refraction index $n_{\beta}$: 1.52
Refraction index $n_{\gamma}$: 1.554
Color: colorless, white
Diaphaneity: transparent
Luster: vitreous