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MnO₂

Manganese dioxide

IUPAC : Manganese dioxide
OxideMineralIndustrialLaboratoryMineral/geological

The most stable and most abundant manganese oxide. Main ore of manganese (pyrolusite), cathode of alkaline batteries and catalyst for H₂O₂ decomposition.

3D ball-and-stick representation of Manganese dioxide (formula MnO₂). Constituent atoms: Mn, O.
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Physical properties

Molar mass86.937 g/mol
State at 20 °Csolid
Density5.026 g/cm³
Melting point—
Boiling point—
Solubility (H₂O)insoluble

Structure

Crystal systemTetragonal
3D render modeBall-and-stick

Uses and applications

  • Cathode of alkaline and zinc-carbon batteries
  • Ferromanganese production for steel
  • Catalyst (H₂O₂ decomposition, glass-making)
  • Historical pigment (cave paintings, ceramics)
  • Classic catalysis demonstration in chemistry classes

Safety (GHS)

GHS07 · Harmful / irritantGHS08 · Health hazard (CMR)
H statements : H302, H332

Harmful if swallowed or inhaled. Chronic exposure to manganese dust can cause manganism (a neurological disorder).

Constituent elements

25Mn
Manganese
8O
Oxygen

References

PubChem CID14801
CAS1313-13-9
SMILESO=[Mn]=O
Sources : PubChem CID 14801 · CRC Handbook of Chemistry and Physics