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‘Green earths’: vibrational and elemental characterization of glauconites, celadonites and historical pigments
‘Green earths’ are employed since antiquity as pigments in the creation of artworks. The minerals responsible for the colour belong to four groups: (1) the clayey micas celadonite and glauconite,Expand
Raman spectroscopy of (Ca,Mg)MgSi2O6 clinopyroxenes
Abstract The Raman spectra of eight clinopyroxenes synthesized along the join diopside-clinoenstatite (Di- Cen, CaMgSi2O6-Mg2Si2O6) were measured. The splitting of the 670 cm-1 mode of the AgExpand
Physical-chemical properties and metal budget of Au-transporting hydrothermal fluids in orogenic deposits
Abstract We use a set of analytical techniques for fluid inclusion analysis to determine the bulk properties of the ore fluids from five orogenic gold deposits. The most common ore fluid is a lowExpand
Raman fingerprint of chromate, aluminate and ferrite spinels
Synthetic and natural spinel single crystals having compositions closely approaching spinel end-members ZnCr2O4, MgCr2O4, FeCr2O4, ZnAl2O4, MgAl2O4, CoAl2O4, FeAl2O4, MnAl2O4, MgFe2O4, and FeFe2O4Expand
Micro‐Raman mapping of the polymorphs of serpentine
Serpentinites are rocks, often used in buildings, formed in large extent by minerals of the serpentine group: chrysotile, antigorite, lizardite, and polygonal serpentine. The fibrous type (e.g.Expand
Micro-Raman spectroscopy as a routine tool for garnet analysis.
A rapid system to obtain molar compositions of minerals belonging to the garnet group by means of Raman spectroscopy is illustrated here. A series of standard garnets, whose composition wasExpand
The Raman spectrum of diopside: a comparison between ab initio calculated and experimentally measured frequencies
The Raman spectrum of diopside has been calculated by using three purely Density Functional Theory (DFT) Hamiltonians (PBE, WCPBE, LDA), the Hartree-Fock Hamiltonian (HF) and three hybrid HF/DFT onesExpand
Characterization of colorants and opacifiers in roman glass mosaic tesserae through spectroscopic and spectrometric techniques
Several glass mosaic tesserae were recovered during the archeological excavation of the thermal baths at the ‘Villa dei Quintili’ in Rome and dated to the second century ad. This work reports theExpand
Raman study of Bi2O3-GeO2-SiO2 glasses
Raman spectra have been obtained for 2Bi 2 O 3 -3[(GeO 2 ) x -(SiO 2 ) 1-y ][2-3 composition) and 6Bi 2 O 3 -[(GeO 2 ) x -(SiO 2 ) 1-x ] (6-1 composition) glasses at different Ge/Si nominal ratios.Expand
Phonon confinement effects in the Raman scattering by TiO2 nanocrystals
Nanocrystalline TiO2 has been obtained by a sol-gel process by controlling the crystal size through the water/alkoxide ratio. Raman spectra of anatase nanocrystals with average sizes of 9.5–13.4 nmExpand