Mixite | SSHADE

Solid phase

Official name: Mixite

Family: covalent network solid
Class: tridimentional covalent network solid
Compound type: arsenate

Chemical composition

Formula: $Bi^{3+}Cu_6(AsO_4)_3(OH)_6 \bullet 3H_2O$
Chemical formula: BiCu6(AsO4)3(OH)6•3H2O
Elemental formula: (Bi3+) (Cu2+)6 As3 O6 (O-)15 H12
Isotope mixture type: terrestrial abundance

38.0

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$Bi^{3+}$	Bismuth cation	element	1	0.05263157894736842	1	constituent cation	main
	$Cu^{2+}$	Copper cation	element	6	0.3157894736842105	1	constituent cation	main
	$(AsO_4)^{3-}$	Arsenate anion	chemical function	3	0.15789473684210525	1	constituent anion	main
	$(OH)^-$	Hydroxide anion	chemical function	6	0.3157894736842105	1	constituent anion	main
	$H_2O$	Water	molecule	3	0.15789473684210525	1	hydration	main

Chemical functions and bonds

Chemical functions

	Function	Number
	$(AsO_4)^{3-}$	3
	$(OH)^-$	6
	$R-OH$	2

Chemical bonds

	Bond	Number
	$-O-H$	2
	$\dddot - \dddot - \dddot - As \dddot - O^{-3/4}$	3
	$O^--H$	1

Class: tridimensional covalent networks (11)
Type: multi mixed atoms tridimensional networks with some ionic bonds (11.07)

Associated phases

Equivalent mineral: Mixite

Crystallography

Phase type: crystalline
Crystal system: hexagonal
Crystal class: dipyramidal
Crystal class symbol: 6/m (C6h)
Crystal spacegroup: P6(3)/m

Physical properties

Molar mass: 1163.1 $g/mol$
Density: 3.8 $g/cm^3$

Thermodynamical properties

State NTP: solid

Optical properties

Refringence type: uniaxial
Refringence sign: positive
Birefringence: 0.080
Refraction index $n_{\alpha}$: 1.743 - 1.749
Refraction index $n_{\beta}$: 1.810 - 1.830
Pure color: blue green
Color: blue green, light blue, light green
Diaphaneity: transparent to translucent
Luster: adamantine

Links and Publications

Links