Solid phase
Official name
Iron(II) oxide
Secondary names
ferrous oxide; FeO; iron monoxide
CAS number
1345-25-1
Type
Family
covalent network solid
Class
tridimentional covalent network solid
Compound type
oxide-hydroxide
Chemical composition
Formula
$Fe^{2+}O$
Chemical formula
FeO
Elemental formula
(Fe2+) O
Isotope mixture type
terrestrial abundance
4.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$Fe^{2+}$ Iron(II) cation element 1 0.5 1.0 constituent element main
$O$ Oxygen element 1 0.5 1.0 constituent element main
Class
tridimensional covalent networks (11)
Equivalent mineral
Wustite
Phase type
crystalline
Crystal system
isometric (cubic)
Crystal class
hexoctahedral
Crystal class symbol
m-3m (Oh)
Crystal spacegroup
Fm-3m
Molar mass
71.85 $g/mol$
Density
5.88 $g/cm^3$
State NTP
solid
Refringence type
isotropic
Refringence sign
no
Birefringence
0
Refraction index $n_{\alpha}$
2.11-2.13
Pure color
gray
Color
gray, black, brown
Diaphaneity
opaque
Luster
metallic
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