Constituent
Name
Gd2Si2O7
Official name
Gadolinium pyrosilicate
Family
ionic solid
Class
alkali salt
Compound type
silicate
Comments
the others polymorphes are a tetragonal phase $\beta-Gd_2Si_2O_7$, monoclinic and trigonal phases
Constituent abundance in material
Relevance
main - major
Arrangement
single phase
Mass fraction
1.0
Mole fraction
1.0
Chemical composition
Formula
$Gd_2Si_2O_7$
Chemical formula
Gd2Si2O7
Elemental formula
(Gd3+)2 Si2 O (O-)6
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$Gd^{3+}$ Gadolinium cation element 2 0.6666666666666666 1 constituent cation main
$(Si_2O_7)^{6-}$ Sorosilicate anion chemical function 1 0.3333333333333333 1 anionic radical main
Chemical functions
  Function Number
$(Si_2O_7)^{6-}$ 1
Chemical bonds
  Bond Number
$\cdot (\cdot) Gd^{3+} \cdot O^{-}-$ 6
$\geq Si-O-$ 2
$\geq Si-O^-$ 6
Class
normal salts (07)
Type
simple normal salts (07.01)
Phase name
$\alpha-Gd_2Si_2O_7$
Phase type
crystalline
Crystal system
orthorhombic
Crystal class
dipyramidal
Crystal class symbol
mmm (D2h)
Crystal spacegroup
Pnma
Texture
polycrystalline
Molar mass
482.66 $g/mol$
Density
5.5 $g/cm^3$
Refringence type
biaxial
Color
colorless, white
Diaphaneity
transparent to translucent