Constituent
Name
BiCu6(AsO4)3(OH)6.3H2O - mixite
Official name
Mixite
Family
covalent network solid
Class
tridimentional covalent network solid
Compound type
arsenate
Constituent abundance in material
Relevance
main - major
Arrangement
single phase
Mass fraction
1.0
Mole fraction
1.0
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
  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 Relevance
$(AsO_4)^{3-}$ 3
$(OH)^-$ 6
$R-OH$ 2 main
Chemical bonds
  Bond Number Relevance
$-O-H$ 2 main
$\dddot - \dddot - \dddot - As \dddot - O^{-3/4}$ 3
$O^--H$ 1
Class
tridimensional covalent networks (11)
Type
multi mixed atoms tridimensional networks with some ionic bonds (11.07)
Phase type
crystalline
Crystal system
hexagonal
Crystal class
dipyramidal
Crystal class symbol
6/m (C6h)
Crystal spacegroup
P6(3)/m
Texture
polycrystalline
Molar mass
1163.1 $g/mol$
Density
3.8 $g/cm^3$
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
Color
blue green, light blue, light green
Diaphaneity
transparent to translucent
Luster
adamantine