Hydrous oxides are inorganic compounds of metal, hydroxide and weakly bound water. Some common examples include:
- Hydrous ferric oxide (HFO) also 
- Hydrous cupric oxide 
- hydrous thorium oxide (THO) and hydrous titanium oxide (TiHO) 
- hydrous aluminum oxide (HAO)
Some others are gels.
HFO and HAO may also result from oxidative weathering of rocks to produce iron an aluminum hydrous oxide clay soils.
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