Apjohnite

apjohnite

halotrichite

pickeringite

gunningite

Images

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

Efflorescences

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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