Chromium(III) oxide | SSHADE

Processing math: 100%

Solid phase

Official name: Chromium(III) oxide

Name and identifiers

Secondary names: Chromium sesquioxide; Chromia; Eskolaite
CAS number: 1308-38-9

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 functions and bonds

Chemical bonds

	Bond	Number
	$>Cr-O$	6

Class: pseudometals (14)
Type: homovalent bilayer pseudometals (14.02)

Associated phases

Equivalent mineral: Eskolaite

Crystallography

Phase type: crystalline
Crystal system: trigonal
Crystal class: ditrigonal-scalenohedral
Crystal class symbol: -3m (D3d)
Crystal spacegroup: R-3c

Physical properties

Molar mass: 151.99 $g/mol$
Density: 5.22 $g/cm^3$

Thermodynamical properties

State NTP: solid

Optical properties

Refringence type: uniaxial
Pure color: green
Diaphaneity: translucent to opaque
Luster: metallic

Links and Publications

Links

Wikipedia