Constituent
Name
Amorphous silicate Mg$_{(1-x)}$Fe$_x$SiO$_3$, x=0.2
Official name
Mg2SiO4-MgSiO3 series
Family
covalent network solid
Class
tridimentional covalent network solid
Compound type
non-oxide ceramic
Constituent abundance in material
Relevance
main - major
Arrangement
single phase
Mass fraction
1.0
Mole fraction
1.0
Chemical composition
Formula
Mg$_{(1-x)}$Fe$_x$SiO$_3$, x=0.2$. Mg$_{0.8}$Fe$_0.2$SiO$_3$
Chemical formula
(MgO)2(SiO2)x
Elemental formula
(Mg)0.8-2 Fe0.2 (Si)1-2 (O)3-6
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$Mg$ Magnesium element 0.8 - 2 0.18421052631578946 $\pm$ 0.07894736842105263 1.0 pure main
$Fe$ Iron element 0.2 0.026315789473684213 1.0 pure main
$Si$ Silicon element 1 - 2 0.19736842105263158 $\pm$ 0.06578947368421052 1.0 pure main
$O$ Oxygen element 3 - 6 0.5921052631578948 $\pm$ 0.19736842105263158 1.0 pure main
Class
molecular solids with apolar molecules (01)
Type
with monoatomic apolar molecules (A) (01.01)
Phase type
amorphous
Crystal system
amorphous
Crystal class
N/A
Crystal class symbol
N/A
Crystal spacegroup
N/A
Molar mass
140.69 - 200.78 $g/mol$
Refringence type
biaxial
Refringence sign
positive or negative
Birefringence
0.009 - 0.033
Refraction index $n_{\alpha}$
1.636 - 1.668
Refraction index $n_{\beta}$
1.650 - 1.673
Refraction index $n_{\gamma}$
1.659 - 1.679