Constituent
Name
(Fe,Mg)O, stoichiometric Fe content 0.4
IMA name
Ferropericlase
Class
non-silicate mineral
Compound type
oxide-hydroxide
Constituent abundance in material
Relevance
main - major
Arrangement
single phase
Mass fraction
1.0
Chemical composition
Formula
Fe$_{0.4}$Mg$_{0.6}$O
Chemical formula
Fe0.4Mg0.6O
Elemental formula
(Fe2+)0.4-1 (Mg)0-0.6 O
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Fe^{2+}$ Iron(II) cation element 0.4 - 1 1.0 constituent element main
$Mg$ Magnesium element 0 - 0.6 1.0 constituent element main
$O$ Oxygen element 1 1.0 constituent element main

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)
Phase type
crystalline
Crystal system
isometric (cubic)
Crystal class
hexoctahedral
Crystal class symbol
m-3m (Oh)
Crystal spacegroup
Fm-3m
Molar mass
52.92 $g/mol$
Density
3.59 $g/cm^3$
Refringence type
isotropic
Refraction index $n_{\alpha}$
1.74 - 2.13
Color
various
Diaphaneity
transparent to opaque
Luster
various