5735. Manganese Oxide

Nomenclature

CAS number: 1317-35-7
Manganomanganic oxide; manganese tetroxide.
Mn3O4; mol wt 228.81.
Mn 72.03%, O 27.97%.

Description and references

Occurs in nature as the mineral hausmannite. Prepn: Moore et al., J. Am. Chem. Soc. 72, 856 (1950).

Properties

Brownish-black powder. d 4.7. Insol in water. Sol in HCl with evolution of chlorine.

Caution

Potential symptoms of overexposure are asthenia, insomnia, mental confusion; low back pain, vomiting, malaise, fatigue; kidney damage; pneumonitis. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 192.