| Apjohnite | |
| Formula: | MnAl(SO)·22HO |
| Imasymbol: | API |
| Color: | Colourless, white, light pink, light yellow, light green |
| Mohs: | 1.5-2 |
| Luster: | Silky |
| Streak: | White |
| Diaphaneity: | Transparent, Translucent |
| Gravity: | 1.78 - 1.81 |
| Density: | 1.78 - 1.81 g/cm3 (Measured) 1.836 g/cm3 (Calculated) |
Apjohnite (IMA symbol: Apj[1]) is a manganese aluminium sulfate mineral with the chemical formula MnAl(SO)·22HO. It was named after Trinity College Dublin professor James Apjohn. Its type locality is Maputo Province, Mozambique.[2]