Demicheleite-(I)

demicheleite-(I)

godovikovite

panichiite

aolosite

Images

Formula: BiSI
Iodide-Sulphide of bismuth
Crystal System: Orthorhombic
Specific gravity: 6.411 calculated
Streak: Brown
Colour: Dark red to black
Luminescence: Not fluorescent under UV
Environments

Fumeroles

Localities

At the type locality, La Fossa crater, Vulcano Island, Lipari, Eolie Islands, Metropolitan City of Messina, Sicily, Italy, demicheleite-(I) was found in the active medium-temperature (~250°C) intracrateric fumarole. It is the first bismuth iodide-sulphide so far (2010) discovered in a wholly natural environment, and corresponds to the already known synthetic compound. It occurs as acicular to stout, translucent crystals up to 0.25 mm long in an altered pyroclastic breccia, together with demicheleite-(Br), bismoclite, bismuthinite, godovikovite, panichiite, aiolosite, brontesite, adranosite and other new phases under study in 2010 (MM 74.1.141-145).

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