Pinnoite | SSHADE

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Mineral phase

IMA name: Pinnoite

Class: non-silicate mineral
Compound type: borate

Chemical composition

Formula: $MgB_2O_4 \bullet 3(H_2O)$
Chemical formula: MgB2O4•3(H2O)
Elemental formula: Mg B2 O7 H6
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Mg$	Magnesium	element	1		constituent element	main
	$B$	Boron	element	2		constituent element	main
	$O$	Oxygen	element	4		constituent element	main
	$H_2O$	Water	molecule	3		hydration	main

Chemical functions and bonds

Chemical functions

	Function	Number
	$R-OH$	2

Chemical bonds

	Bond	Number
	$\geq B-O-$	8
	$-O-H$	2

Oxides composition

Oxides

Formula	$MgO$	$B_{2}O_{3}$	$H_{2}O$
Mass fraction (%)	24.58	42.46	32.96

Classifications

Strunz

Class: borates (06)
Division: diborates (06.B)
Family: Neso-diborates with double tetrahedra B2O(OH)6; 2(2T) (06.BB)
Code: 06.BB.05

Dana

Major class: carbonates, nitrates, borates (V)
Class: anhydrous borates containing hydroxyl or halogen (25)
Type: 25.02
Group: -Pinnoite- group (25.02.03)
Code: 25.02.03.01

Crystallography

Phase type: crystalline
Crystal system: tetragonal
Crystal class: pyramidal
Crystal class symbol: 4 (C4)
Crystal spacegroup: P4(2)

Physical properties

Molar mass: 163.97 $g/mol$
Density: 2.29 $g/cm^3$

Thermodynamical properties

State NTP: solid

Optical properties

Refringence type: uniaxial
Refringence sign: positive
Birefringence: 0.010
Refraction index $n_o$ (w): 1.565
Refraction index $n_e$ (e): 1.575
Pure color: colorless
Color: colorless, yellow, yellow green, light yellow
Diaphaneity: translucent
Luster: vitreous

Links and Publications

Links