Leonardsenite del Vesuvio (secondo ritrovamento mondiale)

As a part of the scientific agreement
between the Dipartimento di Chimica
- Università degli Studi di Milano and
the Osservatorio Vesuviano (Napoli),
the content of the bottles belonging
to the historical collection of the
Osservatorio, most of them collected
before the 1944 eruption, was examined.
The study allowed to identify
several new phases, among which
the recently described d’ansite-(Mn).
In samples collected by A. Malladra in
1920, leonardsenite, MgAlF5(H2O)2,
was identified.
The mineral occurs as minute colorless
prismatic crystals, wit maximum
size of about 100 microns. The identification
was obtained by single-crystal
X-ray diffraction. The unit-cell
data are: a 7.083(3); b 10.155(4);
c 6.816(3) Å. This is the second discovery
in the world.

Balić-Žunić, T., Garavelli, A., Acquafredda, P., Leonardsen, E., Jakobsson, S.P. (2009): Eldfellite, NaFe(SO4)2, a
new fumarolic mineral from Eldfell volcano, Iceland. Mineralogical Magazine, 73, 51-57.
Balić-Žunić, T., Garavelli, A., Mitolo, D., Acquafredda, P., Leonardsen, E., Jakobsson, S.P. (2010): Crystal chemistry
of silicofluorides. Acta Crystallographica, A66, 179.
Balić-Žunić, T., Garavelli, A., Mitolo, D., Acquafredda, P., Leonardsen, E. (2012): Jakobssonite, CaAlF5, a new
fumarolic mineral from the Eldfell and Hekla volcanoes, Iceland. Mineralogical Magazine, 76, 751-760.
Demartin, F., Campostrini, I., Castellano, C., Gramaccioli, C.M., Russo, M. (2012): D’ansite-(Mn),
Na21Mn2+(SO4)10Cl3 and d’ansite-(Fe), Na21Fe2+(SO4)10Cl3, two new minerals from volcanic fumaroles. Mineralogical
Magazine, 76, 2773-2783.
Garavelli, A., Mitolo, D., Balić-Žunić, T., Jakobsson, S.P., Vurro, F. (2009): Fluorine enrichment in volcanic sublimates
from Mt. Hekla (Iceland). Plinius, 35, 746-747.
Garavelli, A., Balić-Žunić, T., Mitolo, D., Acquafredda, P., Leonadsen, E., Jakobsson, S.P. (2010a): Heklaite,
KNaSiF6, a new fumarolic mineral from Hekla volcano, Iceland. Mineralogical Magazine, 74, 147-157.
Garavelli, A., Balić-Žunić, T., Mitolo, D., Acquafredda, P., Leonardsen, E., Jakobsson, S.P. (2010b): A new
fluorine-rich phase from Eldfell volcano, Iceland. Acta Mineralogica-Petrographica Abstract Series, 6, 496.
Jakobsson, S.P., Leonardsen, E.S., Balić-Žunić, T, Jonsson, S.S. (2008): Encrustations from three recent volcanic
eruptions in Iceland: The 1963-1967 Surtsey, the 1973 Eldfell and the 1991 Hekla eruptions. Fjölrit
Náttúrufraedistofnunar, 52, 165.
Mitolo, D., Garavelli, A., Balić-Žunić, T., Acquafredda, P., Jakobsson, S.P. (2011): Leonardsenite, IMA 2011-
059. CNMNC Newsletter No. 11, December 2011. Mineralogical Magazine, 75, 2887-2893.
Mitolo, D., Balić-Žunić, T., Garavelli, A., Acquafredda, P., Leonardsen, E., Jakobsson, S.P. (2010): MgAlF5·1,5H2O:
a new phase from Eldfell volcano, Iceland. Plinius, 36, 374.Mitolo, D., Garavelli, A., Pedersen, L., Balić-Žunić, T., Jakobsson, S.P., Vurro, F. (2008): Mineralogy of actually
forming sublimates at Eldfell volcano (Heimaey Island, Vestmannaeyjar Archipelago, Iceland. Plinius, 34,
322.
Mitolo, D., Garavelli, A., Balić-Žunić, T., Acquafredda, P., Jakobsson, S.P. (2013): Leonardsenite, MgAlF5(H2O)2,
a new mineral species from Eldfell volcano, Heimaey Island, Iceland. Canadian Mineralogist, 51, 377-386.
Oskarsson, N. (1981): The chemistry of Icelandic lava incrustations and the latest stages of degassing. Journal
of Volcanology and Geothermal Research, 10, 93-111.
Smith, D.G.W., Nickel, E.H. (2007): A system for codification for unnamed minerals: report of the Subcommittee
for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification.
Canadian Mineralogist, 45, 983-1055; http://pubsites.uws.edu.au/ima-cnmnc/Valid2010.pdf.