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Formula:
Al2Fe3+2(SO4)6(H2O)12.6H2O
Hydrated sulphate, coquimbite group
Crystal System: Trigonal
Specific gravity: 2.03 measured, 2.044 calculated for the empirical formula
Streak: White
Colour: Colourless to pale pink
Luminescence: Not fluorescent under short wave or long wave UV
Environments
Localities
At the type locality, Grotta dell'Allume, Faraglione Nico, Faraglioni di Levante, Porto Levante, Vulcano Island,
Lipari, Eolie Islands, Metropolitan City of Messina, Sicily, Italy, aluminocoquimbite occurs as a product of
lowtemperature (less than 100°C) fumarolic activity. It forms colourless to pale pink tabular or short prismatic
crystals up to 0.5 mm in size, associated with alunogen,
coquimbite, krausite,
tamarugite, voltaite,
pertlikite, yavapaiite,
pickeringite and
metavoltine
(CM 48.6.1465-1468).
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