Millosevichite

millosevichite

letovicite

boussingaultite

sal ammoniac

Images

Formula: Al₂(SO₄)₃.14H₂O
Anhydrous sulphate
Crystal System: Trigonal
Specific gravity: 1.72 (AM 59.1141)
Hardness: 1½
Streak: Red
Colour: Red, violet-blue
Solubility: Insoluble in water, dissolved by acids, slight change at 95^oC (hygroscopic water), large endothermic change at 850^oC (decomposition of sulfate) (Mindat)
Environments

Fumeroles
Coal-seam fires

Millosevichite occurs in high temperature fumaroles and in burning coal (HOM). It is hygroscopic and easily altered (Mindat).

Localities

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).

Back to Minerals