Abstract Manganese oxides occur typically as cryptocrystalline and fine‐grained mixtures of different Mn‐phases, carbonates, silicates, Fe oxides/hydroxides; thus their characterization by standard methods, such X‐ray diffraction, is extremely challenging. These materials have been widely used in various applications over the millennia, for example, art works pigments pottery, mural paintings, stained glass, recently, nanostructured with very attractive physicochemical properties....

In this work we investigate the strongly inhomogeneous distribution of CO2 and H2O in a synthetic beryl having peculiar hourglass zoning Cr due to crystal growth. The sample was treated at 800°C, 500 MPa, CO2-rich atmosphere. High-resolution FESEM images revealed that boundary is not correlated physical discontinuities, least scale tens nanometers. Polarized FPA-FTIR imaging, on other side, chemical acts as fast pathway for carbon dioxide diffusion, feature never observed so far minerals....

Manganese oxides are important geomaterials, widespread in terrestrial and Martian environments. Characterisation of the oxidation state Mn is a central issue science; this task has been addressed up to present by X‐ray spectroscopy or diffraction techniques. The former, however, requires access synchrotron facilities, while latter does not provide crystal‐chemical information at local scale. In work, we compare large set Raman data from well‐characterised samples, already published same...

Research Article| January 01, 2014 SR-FTIR Microscopy and FTIR Imaging in the Earth Sciences Giancarlo Della Ventura; Ventura 1Dipartimento Scienze, Università di Roma Tre, Largo S. Leonardo Murialdo 1, I-00146 Roma, Italy, giancarlo.dellaventura@uniroma3.it, fabio.bellatreccia@uniroma3.it2Istituto Nazionale Fisica Nucleare, Laboratori Nazionali Frascati, Via E. Fermi 40, I-00044 Frascati (Rome), marcelli@lnf.infn.it Search for other works by this author on: GSW Google Scholar Augusto...

Opals are naturally occurring hydrous silica materials (SiO 2 *nH O), characterized by different degrees of crystallinity and crystal structure. Because their optical properties, opals have been largely used in jewelry as decorative elements artworks. For this reason, a complete characterization provenance study kind is mandatory order both to avoid frauds reconstruct ancient modern trade routes gems. In work, we present combined spectroscopic (Raman, FTIR) X‐ray powder diffraction (XRD)...

Manganese oxides are important geomaterials, used in a large number of applications. For instance, as pigments art works or the treatment and removal heavy metals from drinking water. Particularly, ramsdellite [Mn4+O2] groutellite [(Mn0.5 4+,Mn0.5 3+)O1.5(OH)0.5], because their 2 × 1 frameworks that enable proton diffusion, very cathode materials. commonly occur crypto-crystalline fine mixtures different Mn-phases, iron oxides, silicates carbonates. Thus, proper characterization can be...

Abstract An epidemiological and environmental study of the area around Biancavilla (CT, Italy) was prompted by a significant incidence malignant pleural mesothelioma, which not related to specific occupational activity. dispersion fibres found attributed local quarry activities, whose extracted volcanic products also contained fibrous amphiboles had been used extensively in building industry, especially period 1960–1970. Abundant yellowish grey-whitish asbestiform with strongly asymmetric...

This paper reports a single-crystal FTIR spectroscopic study of vishnevite, ideally [Na6(SO4)] [Na2(H2O)2](Si6Al6O24), member the cancrinite group feldspathoids. The was done on several crystals from various geological occurrences. Infrared spectra show that most samples, and in particular specimens holotype locality at Vishnevye Mountains (Urals, Russia), contain molecular CO2 as main carbon species structural pores, while Loch Borolan (Scotland) were found to be CO3-rich. Polarized-light...

The crystal structure and chemistry of two natural pollucite samples, from Buckfield, Oxford County, Maine (sample M3), Kanzit Mawaie, Laghman, Nooristan, Afghanistan N5), have been investigated by means wavelength-dispersive X-ray microanalysis, thermogravimetric analysis, single-crystal neutron diffraction, Fourier-transform infrared spectroscopy. diffraction patterns the crystals show a metrically cubic unit cell [with aM3 = 13.6914(6) Å aN5 13.6808(6) data; deviation isometry is...

Abstract Titanite occurs in the groundmass of a holocrystalline volcanic ejectum collected pyroclastic rocks Vico Volcanic complex at Tre Croci, near Viterbo, Italy. The host rock is composed abundant K-feldspar and minor plagioclase, biotite, clinopyroxene feldspathoid (sodalite). typically associated with zirconolite, biotite Fe-oxides. It has medium Al content (Al 2 O 3 + Fe = 4–6 wt.%) contains significant amounts Zr LREE , chondrite- normalised REE pattern similar to those titanites...

Abstract This paper reports an infrared spectroscopic study of a set sodalite-group minerals. The specimens have been identified using combination X-ray diffraction and microchemical analysis. As expected, the Si/Al ratio is ~1; extra framework cation content characterized by well-defined Na ⇌ (Ca+K) substitution. lattice parameters studied samples range from sodalite (sample LM11) with = 8.889(2) Å, to haüyne HR3S) 9.1265(2) Å. specimens, having SO 2– group as dominant anion, show clear...

Abstract The crystal-chemical relationships occurring within a single grain of monazite-(Ce) from Vetralla, Vico Volcanic Complex, north Rome, are outlined. sample is miarolitic cavity in holocrystalline ejectum consisting K-feldspar plus minor plagioclase, mica and Fe-oxides, collected pyroclastic explosive level. Gandolfi film (Cu- K α radiation) can be indexed space group P 2 1 / n with = 6.816(4); b 6.976(4); c 6.471(3) Å; β 103.63(3)°; V 299.0(6) Å 3 . Electron-probe microanalyses plot...