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Formula: Mn2+Al2(SO4)4.22H2O
Hydrated normal sulphate, halotrichite group, forms a series with
halotrichite and with
pickeringite,
manganese-bearing
mineral
Crystal System: Monoclinic
Specific gravity: 1.78 to 1.81 measured, 1.836 calculated
Hardness: 1½ to 2
Streak: White
Colour: Colourless, white, light pink, light yellow, light green
Environments
Apjohnite occurs as efflorescences associated with halotrichite,
pickeringite, gunningite,
copiapite and epsomite
(HOM).
Localities
The type locality is Maputo Bay, Maputo, Maputo Province, Mozambique.
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