Mineral phase
IMA name
Wustite
Type
Class
non-silicate mineral
Compound type
oxide-hydroxide
Chemical composition
Formula
$Fe^{2+}O$
Chemical formula
(Fe2+)O
Elemental formula
(Fe2+) O
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Fe^{2+}$ Iron(II) cation element 1 constituent element main
$O$ Oxygen element 1 constituent element main
Composition comments
Common impurities: Si, Mn, Cr3+, Mg, Ti, Al (typical <0.5% total)
Oxides
Formula $FeO$
Mass fraction (%) 100.0

Strunz

Class
oxides - hydroxides - arsenites (04)
Division
metal:oxygen = 2.1 and 1:1 (04.A)
Family
M:O = 1:1 (and up to 1:1.25) with small to medium-sized cations only (04.AB)
Code
04.AB.25

Dana

Major class
oxides and hydroxides (III)
Class
simple oxides (04)
Type
with a cation charge of 2+ (A++O) (04.02)
Group
Periclase group (Isometric, Fm3m) (04.02.01)
Code
04.02.01.06
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
Refraction index $n_{\alpha}$
2.11-2.13
Pure color
gray
Color
gray, black, brown
Diaphaneity
opaque
Luster
metallic
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