Solid phase
Official name
Mixite
Type
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
  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)
Equivalent mineral
Mixite
Phase type
crystalline
Crystal system
hexagonal
Crystal class
dipyramidal
Crystal class symbol
6/m (C6h)
Crystal spacegroup
P6(3)/m
Molar mass
1163.1 $g/mol$
Density
3.8 $g/cm^3$
State NTP
solid
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
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