Apjohnite (IMA symbol: Apj) 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.Apjohnite on mindat.org
References
External links
Apjohnite data sheet on Webmineral Apjohnite on the Handbook of Mineralogy