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Formula: (NH4)4NaAl2(SO4)4Cl(OH)
Anhydrous sulphate, chlorine-bearing mineral
Crystal System: Tetragonal
Specific gravity: 2.15 measured, 2.176 calculated
Streak: White
Colour: Colourless, white
Luminescence: Not fluorescent under UV
Solubility:
Common impurities: K
Environments
Localities
At the type locality, La Fossa crater, Vulcano Island, Lipari, Eolie Islands, Metropolitan City of Messina, Sicily,
Italy, adranosite occurs in an active medium-temperature (~250°C) intracrater fumarole on pyroclastic
breccia in association with
aiolosite, alunite,
anhydrite, bismuthinite,
sassolite,
demicheleite-(Br),
demicheleite-(Cl) and
demicheleite-(I). In addition, in the same environment, other
very unusual species containing ammonium also are present, such as
godovikovite and pyracmonite.
Besides sulphates, there are also ammonium-bearing complex chlorides that contain heavy metals, for instance
panichiite and brontesite and
an ammonium bismuth chloride.
Adranosite forms aggregates of colourless to white acicular crystals up to 0.3 mm in length, with pointed
terminations
(CM 48.315-321).
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