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Formula: BiSBr
Sulphide, bismuth- and bromine- bearing mineral
Crystal System: Orthorhombic
Specific gravity: 6.312 calculated
Streak: Red
Colour: Dark red to black
Luminescence: Not fluorescent under UV
Environments
Localities
At the type locality, La Fossa crater, Vulcano Island, Lipari, Eolie Islands (Aeolian Islands), Metropolitan City
of Messina, Sicily, Italy, demicheleite-(Br) was found in an active high-temperature fumarole at the rim of
the crater. It occurs as prismatic translucent crystals up to 0.5 mm in size in an altered pyroclastic
breccia, together with
pseudocotunnite,
bismoclite, bismuthinite,
cotunnite and
challacolloite
(AM 93.10.1603-1607).
Demicheleite-(Br) from La Fossa -
Image
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