Solid phase
Official name
Magnesium(II) chloride hexahydrate
Secondary names
Magnesium dichloride hexahydrate; Dichloromagnesium hexahydrate; Bischofite; MgCl2.6H2O
CAS number
7791-18-6
Type
Family
ionic solid
Class
normal salt
Compound type
chloride
Chemical composition
Formula
$Mg^{2+}.Cl^-_2 \bullet 6(H_2O)$
Chemical formula
MgCl2.6(H2O)
Elemental formula
(Mg2+) (Cl-)2 H12 O6
Isotope mixture type
terrestrial abundance
18.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$Mg^{2+}$ Magnesium(II) cation element 1 0.1111111111111111 1 constituent cation main
$Cl^-$ Chloride anion element 2 0.2222222222222222 1 constituent anion main
$H_2O$ Water molecule 6 0.6666666666666666 1 hydration main
Chemical functions
  Function Number
$R-OH$ 2
Chemical bonds
  Bond Number
$\cdot Mg^{2+} \cdot Cl^-$ 2
$-O \dots H-$ 12
$-O-H$ 2
Class
normal salts (07)
Type
hydrated simple normal salts (07.04)
Equivalent mineral
Bischofite
Phase type
crystalline
Crystal system
monoclinic
Crystal class
prismatic
Crystal class symbol
2/m (C2h)
Crystal spacegroup
C2/m
Molar mass
203.31 $g/mol$
Density
1.57 $g/cm^3$
State NTP
solid
Refringence type
biaxial
Refringence sign
positive
Birefringence
0.033
Refraction index $n_{\alpha}$
1.495
Refraction index $n_{\beta}$
1.507
Refraction index $n_{\gamma}$
1.528
Dispersion V
r > v, weak
Pure color
colorless
Color
colorless, white
Diaphaneity
transparent to translucent
Luster
vitreous
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