Anhydrous normal sulphate
Specific gravity: 1.72 (AM 59.1141)
Colour: Red, violet-blue
Solubility: Insoluble in water, dissolved by acids, slight change at 95oC (hygroscopic water), large endothermic change at 850oC (decomposition of sulfate) (Mindat)
Millosevichite occurs in high temperature fumaroles and in burning coal
It is hygroscopic and easily altered
At the Kladno Mine, Libušin, Kladno District, Central Bohemian Region, Czech Republic, millosevichite is associated with sulphur, salammoniac, letovicite, alunogen and boussingaultite (HOM).
At the type locality, the Grotta dell'Allume, Faraglione Nico, Faraglioni di Levante, Porto Levante, Vulcano Island, Lipari, Eolie Islands, Messina Province, Sicily, Italy, millosevichite occurs in a fumerole as incrustations composed of countless minute crystals (Mindat).
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