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Formula: (NH4)3PbCl5
Chloride
Crystal System: Orthorhombic
Specific gravity: 2.72 measured, 2.728 calculated for the empirical formula
Streak: White
Colour: Colourless to white
Luminescence: No fluorescence was observed under short wave or long wave UV
Stability: Not hygroscopic and stable in the open air
Common impurities: K,Br
Environments
Brontesite was approved in 2008 and to date (September 2024) has been reported only from the type locality.
Localities
At the type locality, La Fossa crater, Vulcano Island, Lipari, Eolie Islands (Aeolian Islands), Metropolitan City of
Messina, Sicily, Italy, brontesite occurs in an active medium-temperature (~250°C) intracrater fumarole on a
pyroclastic breccia, in close association with
bismuthinite,
godovikovite,
demicheleite-(Cl),
demicheleite-(Br),
alunite, adranosite and
noonkanbahite.
Brontesite forms aggregates of colourless to white, pseudotetragonal, tabular crystals up to 0.1 mm in length
(CM 47.5.1237-1243).
Brontesite from La Fossa crater -
Image
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