| Chemistry name: | manganese hydroxide; hydrated manganic oxide |
| M Formula: | Mn(OH)3; rapidly loses water to form MnO(OH) |
| Properties: | |
| Brown powder. D 4.2–4.4, mp (decomposes). Decomposes in acids. Insoluble in water. | |
| Derivation: | |
| By the action of oxygen on precipitated manganous hydroxide. | |
| Use: | |
| Pigment for fabrics, ceramics. | |