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Formula: Pb2OFCl
Halide, tetragonal paramorph of
rumseyite, which is also tetragonal
Crystal System: Tetragonal
Specific gravity: 7.797 calculated
Hardness: 3
Streak: White
Colour: Colourless
Luminescence: No fluorescence under UV
Environments
Napoliite is a new mineral, approved in 2022 and to date (October 2023) reported only from the type
locality.
Localities
At the type locality, Vesuvius fumaroles, Mount Vesuvius, Somma-Vesuvius Complex, Naples, Campania, Italy,
napoliite occurs as well-shaped lamellar crystals up to 0.25 x 0.25 x 0.01 mm3 typically forming
clusters up to 0.4 x 0.4 mm2 on the surface of volcanic
scoria formed subsequent to the 1944 eruption.
Associated minerals include matlockite,
manuelarossiite,
hephaistosite, cotunnite,
challacolloite, cerussite,
calcioaravaipaite,
atacamite, artroeite and
anglesite
(MM 87.711-718).
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