Solid phase
Official name
Synthetic Iron(II) iron(III) oxide
Secondary names
Iron(II,III) oxide; ferrous ferric oxide; magnetite; ferroso ferric oxide; iron(II) diiron(III) oxide; rust
CAS number
1317-61-9
Type
Family
covalent network solid
Class
tridimentional covalent network solid
Compound type
oxide-hydroxide
Chemical composition
Formula
$Fe_3O_4$ or $FeO.Fe_2O_3$
Chemical formula
Fe3O4
Elemental formula
Fe3 O4
Isotope mixture type
terrestrial abundance
14.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$Fe$ Iron element 3 0.42857142857142855 1.0 pure main
$O$ Oxygen element 4 0.5714285714285714 1.0 pure main
Composition comments
alternative formula: FeO.Fe2O3
Class
tridimensional covalent networks (11)
Type
metal homonuclear tridimensional networks (elemental) (11.02)
Equivalent mineral
Magnetite
Phase name
Iron(II,III) oxide
Phase type
crystalline
Crystal system
isometric (cubic)
Crystal class
hexoctahedral
Crystal class symbol
m-3m (Oh)
Crystal spacegroup
Fd-3m
Molar mass
231.533 $g/mol$
Density
5.17 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid liquid $Fe_3O_4$ 1870 K (1597°C)
Refraction index $n_{\alpha}$
2.42
Pure color
black
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