Apjohnite

Apjohnite (IMA symbol: Apj^[1]) is a manganese aluminium sulfate mineral with the chemical formula Mn²⁺Al₂(SO₄)₄·22H₂O. It was named after Trinity College Dublin professor James Apjohn. Its type locality is Maputo Province, Mozambique.^[2]

Apjohnite
Apjohnite (white) found with ilesite
General
Category	Minerals
Formula	Mn2+Al2(SO4)4·22H2O
IMA symbol	API
Identification
Color	Colourless, white, light pink, light yellow, light green
Mohs scale hardness	1.5-2
Luster	Silky
Streak	White
Diaphaneity	Transparent, Translucent
Specific gravity	1.78 - 1.81
Density	1.78 - 1.81 g/cm3 (Measured) 1.836 g/cm3 (Calculated)