Francesco Radica

Università degli Studi G. d'Annunzio Chieti e Pescara | UNICH

In this paper, we review 10 years of research on high-temperature oxidation process on amphiboles with variable composition. One notable feature that has emerged from our experiments is that iron oxidation is reversible over a relatively large thermal range before the kinetic energy of delocalized electrons and H+ ions becomes high enough to allow...

Four sites in the western sector of Lipari Island with still active hydrothermal activity are here considered. The petrography (mesoscopic observations and XRPD) and geochemistry (major, minor and trace elements chemistry) of ten representative and extremely altered volcanic rocks were characterized. Two types of parageneses of altered rocks are di...

In this paper we describe the results obtained with a novel method to prepare depositions of asbestos fibres for toxicological tests in vitro. The technique is based on a micro-dispenser, working as an inkjet printer, able to deposit micro-sized droplets from a suspension of fibres in a liquid medium; we used here a highly evaporating liquid (ethan...

In this work we address the stability of riebeckite at high temperatures and compare the different behaviors observed under various oxidation conditions. For this purpose, we annealed powders of a sample from Mt. Malosa (Malawi), which is compositionally close to the end-member; the run products obtained after annealing in air vs. in vacuum were st...

In this paper we describe our work aimed at designing a system able to measure the particulate matter (PM) concentrations via an optical particle counter (OPC) and simultaneously collect it via standard 2.5 cm filters for laboratory characterization. The Port of Civitavecchia (Italy), one of the most important maritime hubs of the Mediterranean Sea...

Human exposure to Volatile Organic Compounds (VOCs) and their presence in indoor and working environments is recognized as a serious health risk, causing impairments of varying severities. Different detecting systems able to monitor VOCs are available in the market; however, they have significant limitations for both sensitivity and chemical discri...

Human exposure to Volatile Organic Compounds (VOCs) and their presence in indoor and working environments is recognized as a serious health risk, causing impairment of varying severity. Different detecting systems able to monitor VOCs are available in the market, however they have significant limitations for both sensitivity and chemical discrimina...

In this work, we address the kinetics of dehydrogenation occurring at high temperatures (HT) in riebeckite, a sodic amphibole with the ideal composition Na2Fe23+Fe32+Si8O22(OH)2. We performed isothermal experiments on both powders and single-crystals up to 560 °C and monitored the O-H stretching signal by Fourier transform infrared (FTIR) spectrosc...

Exposure to styrene is a major safety concern in the fibreglass processing industry. This compound is classified by the International Agency for Research on Cancer as a possible human carcinogen. Several types of analytical equipment exist for detecting volatile organic compounds (VOCs) in the atmosphere; however, most of them operate ex-situ or do...

The thermal behavior of melanterite from the Fornovolasco mine (Tuscany, Italy) has been investigated via differential thermal analysis (DTA), thermogravimetry (TG), in situ high-temperature X-ray powder diffraction (XRPD) and Fourier-transform infrared spectroscopy (FTIR). The DTA curve showed endothermic peaks at 70, 100, 260, 500–560 and 660 °C...

In this work, two types of wastes were introduced, namely, glass from municipal waste and Construction and Demolition Waste (CDW). The latter, which was obtained from rubble generated by the seismic events occurred in Central Italy in 2016, was introduced in two configurations, the single-layer and the double-layer of the cement-based Terrazzo tile...

A crystal chemical investigation of a natural specimen of whitlockite, ideally Ca9Mg(PO4)6[PO3(OH)], from Palermo Mine (USA), was achieved by means of a combination of electron microprobe analysis (EMPA) in WDS mode, single-crystal neutron diffraction probe (NDP) and single-crystal X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spec...

Microporous organic-inorganic hybrid silica films have been designed as active platforms to realise a styrene gas sensor. The microporous film has been synthesized by using tetraethylorthosilicate and phenyltriethoxysilane as precursors and a triblock copolymer (Pluronic F127) as a template for the pores. Multilayer films have been employed to incr...

Fluorcarmoite-(BaNa), ideally A1BaA2□B1,2NaNa1,2Na2Na3□CaCaMMg13Al(PO4)11(PO3OH)WF2, was found in a pebble of the riverbed of the upper Maremola Creek, close to the village of Isallo, in the Magliolo municipality (Savona, Liguria, Italy). The root-name is after Monte Carmo di Loano, the highest peak in the area, namesake of the tectonic unit where...

H2O solubility has been experimentally investigated in pantelleritic glasses at 850 °C in the range 0.5-2.5 kbar. Using a synthetic glass analogue of pantelleritic magma from the Kenya Rift Valley (Ebu-1 in Scaillet & MacDonald 2006) as starting composition, the molar Na/(Na+K) ratio was varied from 0 (Ebu-C) to 0.66 (Ebu-B) and 1 (Ebu-N) at consta...

The new mineral species canosioite, ideally Ba2Fe3+(AsO4)2(OH), has been discovered in the dump of Valletta mine, Maira Valley, Cuneo Province, Piedmont, Italy. Its origin is probably related to the reaction between ore minerals and hydrothermal fluids. It occurs in reddish-brown granules, subhedral millimetre-size crystals, with pale yellow streak...

During systematic characterization of amphiboles that still lack a complete mineral description, fluoro-tremolite was identified in a specimen from the Limecrest-Southdown quarry, Sparta, New Jersey, USA, which was provided by the Franklin Mineral Museum. The ideal formula of fluoro-tremolite is A □ B Ca 2C Mg 5T Si 8 O 22W F 2 and the empirical fo...

http://adsabs.harvard.edu/abs/2017AGUFM.V2D0503P

ISSN 2038-1719

The solubility of water in pantelleritic glasses has been investigated experimentally in the range 800-900°C and pressures of 50, 100, 150 and 250 MPa....

In this study, we describe the first FTIR measurements of CO2 desorption from cordierite, a microporous mineral stable up to high T conditions. To this purpose, we collected isothermal heating data on several (001) oriented sections of a well-characterized CO2-rich sample. Single-crystal slabs were heat-treated up to 1000 °C, and the intensity of t...

IMA No. 2015-062 Fluorcarmoite-(BaNa) Ba□Na2Na2□CaMg13Al(PO4)11(PO3OH)F2 Maremola Creek, near the village of Isallo, Magliolo, Savona, Liguria, Italy (44°12′06″N, 8°12′29″E) Fernando Cámara*, Erica Bittarello, Marco E. Ciriotti, Fabrizio Nestola, Francesco Radica and Roberto Bracco *E-mail: fernando.camaraartigas@unito.it Arrojadite group Monoclini...

In this work, we address the intensity evolution of the CO2 FTIR bands of cordierite as a function of increasing T, by comparing data obtained from in situ versus quenching measurements. A natural well-characterized cordierite from Kragero (Arendal region, Norway) was studied up to 1200 °C using a heating stage fitted on a FTIR microscope. Two diff...

IMA No. 2015-030 Canosioite Ba2Fe3+(AsO4)2(OH) Valletta mine, Vallone della Valletta, Canosio (Cuneo), Maira Valley, Piedmont, Italy (44º23’54’’N, 7º5’37’’E, 2560 m asl) Fernando Cámara*, Erica Bittarello, Marco E. Ciriotti, Fabrizio Nestola, Francesco Radica, Federico Massimi, Corrado Balestra and Roberto Bracco *E-mail: fernando.camaraartigas@uni...

In this work we investigate the strongly inhomogeneous distribution of CO2 and H2O in a synthetic beryl having a peculiar hourglass zoning of Cr due to the crystal growth. The sample was treated at 800°C, 500 MPa, in a CO2-rich atmosphere. High-resolution FESEM images revealed that the hourglass boundary is not correlated to physical discontinuitie...

This paper reports on water speciation and diffusion in synthetic beryl samples treated in CO2-rich atmosphere, at 700 MPa and 700 and 800 °C, respectively. The study has been conducted by means of polarized FTIR (Fourier transform infrared) integrated with FPA (focal plane array) imaging. As expected, the infrared spectra show the presence of CO2...

The new mineral species braccoite, ideally NaMn ²⁺ 5 [Si 5 AsO 17 (OH)](OH), has been discovered in the Valletta mine dumps, in Maira Valley, Cuneo province, Piedmont, Italy. Its origin is probably related to the reaction between ore minerals and hydrothermal fluids. It occurs as subhedral crystals in brown-red coloured thin masses, with a pale-yel...

In this short note we describe the recent experimental mineralogy work at University of Roma Tre focused on the diffusion of carbon dioxide within the structural channels of microporous silicates. The results obtained in the last few years for cordierite and beryl are briefly reported, as well as the developments of novel spectroscopic methods to c...

In order to clarify details of volatiles incorporation in arrojadites, two samples previously characterized by X-ray diffraction and electron-microprobe (EMP) and LA-ICPMS analysis were investigated by single-crystal FTIR spectroscopy. The present study confirms and makes more quantitative previous results by single-crystal structure refinement abo...

The new mineral species grandaite, ideally Sr2Al(AsO4)2(OH), has been discovered on the dump of Valletta mine, Maira Valley, Cuneo province, Piedmont, Italy. Its origin is related to the reaction between the ore minerals and hydrothermal solutions. It occurs in thin masses of bright orange to salmon to brown colour, or infrequently as fan-like aggr...

Grandaite IMA 2013- 059, CNMNC Newsletter No. 18, December 2013, page 3250.

Braccoite, IMA 2013-093, CNMNC Newsletter No. 18, December 2013, page 3256.

The crystal chemistry of sekaninaite from Dolní Bory, Czech Republic, was characterized by a multimethod approach. Particular emphasis was put on the characterization of the channel constituents (i.e. H2O and CO2). Electron microprobe analysis shows the sample to be close to the Fe endmember [ X Fe = Fe/(Fe+Mg) = 94%) with significant Mn (1.48 wt.%...

We report a FTIR (Fourier transform infrared) study of a set of cordierite samples from different occurrence and with different H2O/CO2 content. The specimens were fully characterized by a combination of techniques including optical microscopy, single-crystal X-ray diffraction, EMPA (electron microprobe analysis), SIMS (secondary ion mass spectrome...

The piston cylinder apparatus is one of the most versatile instruments operating in laboratories of experimental petrology because it provides a safe, inexpensive, and easy-to-use technique for accessing high-pressure and high-temperature phases and processes. The operating pressure of the piston cylinder usually ranges between 0.5 and 5 GPa, which...