Luminescence properties and geochemical features of Italian “mossottite” and “aragostronzianite”

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Marco E. Ciriotti
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Luminescence properties and geochemical features of Italian “mossottite” and “aragostronzianite”

Messaggio da Marco E. Ciriotti » mer 06 set, 2017 10:42

Referenza:
▪ Dallegno, A., Mazzoleni, G., Menegazzi, R. (2017): Luminescence Properties and Geochemical Features of “mossottite” and “aragostronzianite”: Research on Differently Fluorescing Natural Aragonites from “Colline Metallifere” Mining District in Southern Tuscany, Italy. Journal of The Fluorescent Mineral Society 2015-2016, 35, 4-34.

Abstract:
Abstract
This article provides the ‘state of the art’ of research
on the variously fluorescing and supposedly
strontium-rich natural aragonites, from two close but
different ore deposits in the “Colline Metallifere” Mining
District. Both mining areas, namely Le Cornate (Gerfalco)
and Ballarino (among the main works in Boccheggiano
mines), lie in Montieri municipality (Grosseto
Province) and are considered as linked to the Larderello-
Travale-Montieri geothermal field. The dimly fluorescing
“mossottite” from Gerfalco area was discovered earlier
and defined as a strontium-rich variety of aragonite.
The brightly red-fluorescing Tuscan CaCO3 polymorphs
from Boccheggiano and especially Ballarino mine are
well known among collectors of fluorescent minerals but
are, to date, lacking a safe mineral species identification
and subsequently a correct mineral name. The incorrect
global denominations “aragostronzianite” or “aragonostronzianite”
(Italian collectors’ name for strontium-rich
aragonite) or “mossottite” are still mistakenly used as
synonyms even if these red-fluorescing minerals are, in
most cases, calcite.
The report of strontianite from that locality is
unverified. Such an unsatisfactory situation, in which a
fluorescent mineral, which should be a flagship of Italian
mineralogy, has not been studied since being reported
to the world by Manuel Robbins, has inspired a specific
and systematic study, namely the FluoMIT Project
(Fluorescent Minerals of the Italian Type). The two
mineral varieties, namely the rare “mossottite” from its
locus tipicus Gerfalco (Montieri municipality), previously
defined as a strontium-rich aragonite, and the so-called
“aragostronzianite” from Boccheggiano pyrite mines
(Ballarino locus tipicus) have been investigated and
characterized by combining multi-elemental geochemistry
(ICP-MS analyses) and spectrophotoluminescence
(laser 405nm-excited induced high resolution CW-PL
spectra). Analyses were carried out by selecting appropriate
samples of pure aragonite (not a mixture of calcite
and aragonite) with homogeneous luminescent behavior,
from a batch of 146 specimens. This article provides,
for the first time, the definition of the carmine red
fluorescing (under short-wave UV) Boccheggiano-Type
Aragonite (BTA) as a rare preserved CaCO3 polymorph
(High-Mg Aragonite) in very specific micro-environments
of its source. Strontium content in both “mossottite” and
“aragostronzianite” agrees with many natural aragonites,
so it does not deserve any particular reference to
their varietal name.
The unique fluorescence of BTA is due to a complex
set of activators like lattice defects orignated by
crystalline field strain induced by the entrance of many
small Mg+2 ions and a lesser amount of Mn2+ ions. At
the same time, we register the entrance of significant Li,
Mo, Ba traces, together with a not negligible content of
Sr. Moreover, we recognized the occurrence of specific
activator associations as YLREEs3+, (UO2)2+, Pb2+,
Sn2+, Fe3+ and V2+. Among LREEs, samarium was not
recognized, whereas Pr3+ is involved (as a first report in
natural aragonites). The genesis of the Boccheggiano-
Type Aragonite (BTA) is a key to explain the specific
enrichment processes in a precise location along
Boccheggiano extensional fault. This precise location
yielded the typical trace element associations. Such
associations are clearly related to the overall geochemical
“signature” of deep hydrothermal fluids of specific
granitoid petrofacies grouped in the Tuscan Magmatic
Province. Probable mixing, partial dilution and exchange
processes with shallower hydrothermal fluids
crossing the sulphate-carbonate rocks of the Tuscan
sedimentary sequence have occurred; the same phenomenology
probably has taken place in some Tuscan
metamorphic basement horizons, with the presence of
sulphidic volcanic-exhalative proto-ores.

NdR: Chi è interessato all'articolo può richiedermelo.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Carlo Alciati
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Re: Luminescence properties and geochemical features of Italian “mossottite” and “aragostronzianite”:

Messaggio da Carlo Alciati » gio 07 set, 2017 15:42

Ciao Marco, io sarei interessato all'articolo in questione.
Ti ringrazio in anticipo.

Carlo
Carlo Alciati
Segretario GMI - Gruppo Mineralogico di Ivrea "Aldo Nicola"

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Massimo Russo
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Re: Luminescence properties and geochemical features of Italian “mossottite” and “aragostronzianite”:

Messaggio da Massimo Russo » gio 07 set, 2017 16:24

Anche a me. Grazie Marco

Massimo
---------------------------------------
Massimo Russo
INGV - Osservatorio Vesuviano

"Un minerale senza nome è solo un inutile pezzo di pietra" (Massimo Russo)

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Marco E. Ciriotti
Messaggi: 23495
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: Luminescence properties and geochemical features of Italian “mossottite” and “aragostronzianite”:

Messaggio da Marco E. Ciriotti » gio 07 set, 2017 16:38

Spedito a entrambi.
Buona lettura!
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Graziano Del Core
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Re: Luminescence properties and geochemical features of Italian “mossottite” and “aragostronzianite”

Messaggio da Graziano Del Core » mar 19 set, 2017 21:34

Sono interessato all'articolo.
Grazie anticipatamente.
Saluti.
Graziano Del Core (Socio A.P.M.P.)

Aliena vitia in oculis habemus, a tergo nostra sunt (Seneca)

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Marco E. Ciriotti
Messaggi: 23495
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: Luminescence properties and geochemical features of Italian “mossottite” and “aragostronzianite”

Messaggio da Marco E. Ciriotti » mar 19 set, 2017 22:45

Ciao Graziano.
Ci si vede a Volpiano?
Domani te lo mando.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Graziano Del Core
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Località: Torino

Re: Luminescence properties and geochemical features of Italian “mossottite” and “aragostronzianite”

Messaggio da Graziano Del Core » mer 20 set, 2017 23:15

Ciao Marco,
se riesco vengo solo il mattino, nel pomeriggio devo essere al battesimo di mio nipotino Matteo.
Grazie per l' articolo.
Graziano Del Core (Socio A.P.M.P.)

Aliena vitia in oculis habemus, a tergo nostra sunt (Seneca)

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