Népouite (with some pecoraite outlines) from Campello Monti, Strona Valley, Italy

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Marco E. Ciriotti
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Népouite (with some pecoraite outlines) from Campello Monti, Strona Valley, Italy

Messaggio da Marco E. Ciriotti » gio 04 gen, 2018 18:20

Prossima pubblicazione.

Referenza:
▪ Capitani, G.C. & Ventruti, G. (2018): Ni-serpentine nanoflakes in the garnierite ore from Campello Monti (Strona Valley, Italy): Népouite, but with some pecoraite outlines. American Mineralogist, 103, (in press).
Marco E. Ciriotti

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TOSATO FABIO
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Re: Népouite (with some pecoraite outlines) from Campello Monti, Strona Valley, Italy

Messaggio da TOSATO FABIO » gio 04 gen, 2018 18:53

COMPLIMENTI AGLI AUTORI E... AL MINERALE.
Tosato Fabio
"Il vero viaggio di scoperta non consiste nel cercare nuove terre, ma nell'avere nuovi occhi." M. Proust
Noi siamo anche quello che non siamo riusciti ad essere.
Sic transit gloria mundi.

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Marco E. Ciriotti
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Re: Népouite (with some pecoraite outlines) from Campello Monti, Strona Valley, Italy

Messaggio da Marco E. Ciriotti » lun 08 gen, 2018 12:59

Relativamente alla miniera (una dozzina di gallerie) di Campello Monti è stato appena pubblicato il seguente interessante lavoro dell'Università di Torino.

Referenza:
▪ Mehta, N., Dino, G.A., Ajmone-Marsan, F., Lasagna, M., Romé, C., De Luca D.A. (2018): Extractive waste management: A risk analysis approach. Science of the Total Environment, 622–623, 900–912.

Abstract:
Abandoned mine sites continue to present serious environmental hazards because the heavy metals associated with extractive waste are continuously released into the environment, where they threaten human life and the environment. Remediating and securing extractive waste are complex, lengthy and costly processes. Thus, in most European countries, a site is considered for intervention when it poses a risk to human health and the surrounding environment. As a consequence, risk analysis presents a viable decisional approach towards the management of extractive waste. To evaluate the effects posed by extractive waste to human health and groundwater, a risk analysis approach was used for an abandoned nickel extraction site in Campello Monti in North Italy. This site is located in the Southern Italian Alps. The area consists of large and voluminous mafic rocks intruded by mantle peridotite. The mining activities in this area have generated extractive waste. A risk analysis of the site was performed using Risk Based Corrective Action (RBCA) guidelines, considering the properties of extractive waste and water for the properties of environmental matrices. The results showed the presence of carcinogenic risk due to arsenic and risks to groundwater due to nickel. The results of the risk analysis form a basic understanding of the current situation at the site, which is affected by extractive waste.
Marco E. Ciriotti

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Marco E. Ciriotti
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Re: Népouite (with some pecoraite outlines) from Campello Monti, Strona Valley, Italy

Messaggio da Marco E. Ciriotti » lun 09 apr, 2018 17:28

Pubblicazione effettuata.

Referenza:
▪ Capitani, G.C. & Ventruti, G. (2018): Ni-serpentine nanoflakes in the garnierite ore from Campello Monti (Strona Valley, Italy): Népouite, but with some pecoraite outlines. American Mineralogist, 103, 629–644.

Abstract:
The garnierite ore at Campello Monti occurs as dark green colloform concretions covering surfaces, fractures, and filling veins in harzburgite rocks. The representative composition (Ni2.45Mg0.14Cu0.12Co0.05)S2.76Si2.10O5(OH)4 is consistent with a 7 Å phase, namely pecoraite or népouite. Relevant chemical features are an exceptionally high Ni/Mg ratio, a significant level of Cu substituting for Ni, and a low content of S, possibly in tetrahedral sites.
Olivine and orthopyroxene in the harzburgite host rock are only partially serpentinized, do not contain detectable Ni, and are almost iron free. The green coating probably originated from ground-water solutions that leached nearby weathered peridotites and sulfide ores, and deposited less-mobile elements along fractures and voids of the host peridotite, just outside their provenance area.
Bulk techniques such as X‑ray powder diffraction and infrared spectroscopy do not confidently distinguish between népouite and pecoraite, although the comparison with synthetic, implicitly pure polymorphs indicates népouite as the best matching phase. On the other hand, HRTEM clearly shows that garnierite is mostly constituted by plumose aggregates made of curved crystals with frayed tips, a few nanometers thick along the stacks and a few tens of nanometers long (nanoflakes). All known lizardite stacking sequences, namely 1T, 2H1, and 2H2, have been locally observed, even though most crystals show stacking disorder.
The recorded nanostructure suggests possible explanations for the recurrent anomalies (low oxide totals, high IVT/VIM cation ratios, etc.) found in EMP analyses of garnierites. The small grain size, the high density of defects, and the structural arrangement actually intermediate between lizardite and chrysotile probably explain the ambiguities that occurred during the characterization with bulk techniques. The results obtained in this study may have important implications for ore processing methods.
Marco E. Ciriotti

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Roberto Bracco
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Re: Népouite (with some pecoraite outlines) from Campello Monti, Strona Valley, Italy

Messaggio da Roberto Bracco » lun 09 apr, 2018 18:43

E anche implicazioni per la mineralogia ligure... la "gavite" credo batta il primato dell'UK più longevo in assoluto, 82 anni!!!
Roberto Bracco - AMI Liguria

Perché seguire il calcio, quando accanto c'è lo scandio e poco più in là il vanadio?

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Mirco
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Re: Népouite (with some pecoraite outlines) from Campello Monti, Strona Valley, Italy

Messaggio da Mirco » lun 09 apr, 2018 20:40

Non trovo traccia su Mindat di queste miniere, sbaglio a cercare o non c'è per davvero?
Mirco

"Molte volte le persone ci sembrano grandi solo perchè le guardiamo stando in ginocchio"

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Marco E. Ciriotti
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Re: Népouite (with some pecoraite outlines) from Campello Monti, Strona Valley, Italy

Messaggio da Marco E. Ciriotti » lun 09 apr, 2018 21:46

Su Mindat non c'è, ma miniera e concessione esistono.
Qui brevi informazioni: http://pietredelcusio.weebly.com/upload ... poster.pdf
Marco E. Ciriotti

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