Cobalt(II,III) oxide

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Template:Chembox header | Cobalt(II) oxide
Cobalt(II,III) oxide
Template:Chembox header | General
Systematic name Cobalt(II,III) Oxide
Other names Cobalto-Cobaltic Oxide,
Tricobalt Tetraoxide,
tricobalt tetroxide
Molecular formula Co3O4
Molar mass 240.80 g/mol
Appearance A gray, green, red, or black powder
CAS number 1308-06-1
Template:Chembox header | Properties
Density and phase 6.11 g/cm3
Solubility in water practically insoluble in water
Melting point 895°C (1168 K)
Boiling point  ?°C (? K)
Template:Chembox header | Hazards
MSDS (Use CAS#) Fisher Scientific
Main hazards Respiratory tract inflammation
possibly carcinogenic
NFPA 704 Template:NFPA 704
R/S statement R: 22 43 50-53 S: 22 24 37 60 61
RTECS number GG2500000
Template:Chembox header | Related compounds
Other anions Cobalt(II) carbonate
Cobalt(II) nitrate, Cobalt(II) chloride
Other cations Iron(III) oxide, Iron(II) oxide
Cobalt(II) oxide
Related compounds Cobalt(III) oxide
Template:Chembox header | Except where noted otherwise, data are given for
materials in their standard state (at 25°C, 100 kPa)
Infobox disclaimer and references


Cobalt(II,III) oxide is the most prevalent of cobalt's various oxides. The oxide is typically found in ores alongside containing nickel, arsenic, sulfur, and manganese. These ores can be found in great quantities in Canada, Southern Africa, and Morocco among other locales.

This oxide has a gunmetal gray appearance and is typically distributed in a powdered form.

Derivative Compounds

Reactions of Cobalt(II,III) oxide can yield other oxides with similar characteristics:

When heated in the presence of excess oxygen:

Co3O4(s) + O2(g) → 3 Co2O3(s)

The reaction yields Cobalt(III) Oxide.

Industrial Uses

Health Issues

RTECS recognizes Cobalt(II,III) oxide as a tumorigen in oral LD50 trials with lethal doses of greater than 5g/kg per day in rats. This is characteristic with other oxides of cobalt