Solid phase
Official name
Chromium(III) oxide
Secondary names
Chromium sesquioxide; Chromia; Eskolaite
CAS number
1308-38-9
Type
Family
covalent network solid
Class
pseudometal (semi-conductor)
Compound type
oxide
Chemical composition
Formula
$Cr_2O_3$
Chemical formula
Cr2O3
Elemental formula
Cr2 O3
Isotope mixture type
terrestrial abundance
10.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$Cr$ Chromium element 2 0.4 1 constituent element main
$O$ Oxygen element 3 0.6 1 constituent element main
Chemical bonds
  Bond Number
$>Cr-O$ 6
Class
pseudometals (14)
Type
homovalent bilayer pseudometals (14.02)
Equivalent mineral
Eskolaite
Phase type
crystalline
Crystal system
trigonal
Crystal class
ditrigonal-scalenohedral
Crystal class symbol
-3m (D3d)
Crystal spacegroup
R-3c
Molar mass
151.99 $g/mol$
Density
5.22 $g/cm^3$
State NTP
solid
Refringence type
uniaxial
Pure color
green
Diaphaneity
translucent to opaque
Luster
metallic
Links