In Val d’Ala (Piedmont, Western Alps, Italy), the more interesting rocks for the mineralogical re... more In Val d’Ala (Piedmont, Western Alps, Italy), the more interesting rocks for the mineralogical research are represented by rodingites (rich in mineralized veins and fractures) associated with serpentinites in the eclogitized oceanic crust of Piemonte Zone, south of Gran Paradiso Massif. Among the vein-filling minerals, garnets are the most appreciated as mineral specimens and, in less degree despite their vivid and rich colors, for their potential as gem-quality materials. This study provides a complete gemological characterization of five faceted samples and offers new information by means of Synchrotron X-ray computed micro-tomography imaging gem features. Electron-probe microanalysis (EMPA) and laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) established that the chemical composition of garnets from different localities, resulted both close to pure andradite, enriched in light rare earth elements (LREE) with a positive Eu anomaly, and grossular-andradite so...
In the early 2000s, an exceptional discovery of gem-quality multi-coloured tourmalines, hosted in... more In the early 2000s, an exceptional discovery of gem-quality multi-coloured tourmalines, hosted in Litium-Cesium-Tantalum (LCT) pegmatites, was made in the Adamello Massif, Italy. Gem-quality tourmalines had never been found before in the Alps, and this new pegmatitic deposit is of particular interest and worthy of a detailed characterization. We studied a suite of faceted samples by classical gemmological methods, and fragments were studied with Synchrotron X-ray computed micro-tomography, which evidenced the occurrence of inclusions, cracks and voids. Electron Microprobe combined with Laser Ablation analyses were performed to determine major, minor and trace element contents. Selected samples were analysed by single crystal X-ray diffraction method. The specimens range in colour from colourless to yellow, pink, orange, light blue, green, amber, brownish-pink, purple and black. Chemically, the tourmalines range from fluor-elbaite to fluor-liddicoatite and rossmanite: these chemical ...
... For instance, the logarithm of the stability constant K at 25°C of LnF2+ com plexes for zero ... more ... For instance, the logarithm of the stability constant K at 25°C of LnF2+ com plexes for zero ionicstrength (on decimal basis) ranges from about 3.60 (for La) or about 4 (for Ce) to 4.51 (for Lu ... 8 pegmatite, polycrase-(Y)(7) Trout Creek, CO, Clora May pegmatite, aeschynite-(Y)* ) ...
Eleven specimens of monazite from different occurence$ in fissures and pegmatites in the Alps hav... more Eleven specimens of monazite from different occurence$ in fissures and pegmatites in the Alps have been analyzed by electron microprobe. For some samples from pegma- tites, unit-cell data have been obtained. Fissure monazite is poorer in nonessential elemenls (Si, Ca, Y, Th, (.I) than monazite coming from pegmatites; tlle latter can in places be extraordinarily enriched in uranium and 1fusrirrm.
... beryl, three of bazzite, three of scandiobabingtonite-babingtonite, four of cascandite, five ... more ... beryl, three of bazzite, three of scandiobabingtonite-babingtonite, four of cascandite, five of thortveitite, and one of jervisite (all from the Baveno pluton); and ... The system was operated at an accelerating voltage of 20 kV, a sample current (on brass) of 10 nA, and a counting time ...
... VALERIA DIELLA Centro CNR per la Geodinamica alpina e quaternaria, Via Botticelli 23, I-20133... more ... VALERIA DIELLA Centro CNR per la Geodinamica alpina e quaternaria, Via Botticelli 23, I-20133 Milano, Italy ... These discoveries confirm the similarity between the Baveno and Cuasso al Monte occurrences, and suggest the possi-bility that scandium minerals are more ...
In Val d’Ala (Piedmont, Western Alps, Italy), the more interesting rocks for the mineralogical re... more In Val d’Ala (Piedmont, Western Alps, Italy), the more interesting rocks for the mineralogical research are represented by rodingites (rich in mineralized veins and fractures) associated with serpentinites in the eclogitized oceanic crust of Piemonte Zone, south of Gran Paradiso Massif. Among the vein-filling minerals, garnets are the most appreciated as mineral specimens and, in less degree despite their vivid and rich colors, for their potential as gem-quality materials. This study provides a complete gemological characterization of five faceted samples and offers new information by means of Synchrotron X-ray computed micro-tomography imaging gem features. Electron-probe microanalysis (EMPA) and laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) established that the chemical composition of garnets from different localities, resulted both close to pure andradite, enriched in light rare earth elements (LREE) with a positive Eu anomaly, and grossular-andradite so...
In the early 2000s, an exceptional discovery of gem-quality multi-coloured tourmalines, hosted in... more In the early 2000s, an exceptional discovery of gem-quality multi-coloured tourmalines, hosted in Litium-Cesium-Tantalum (LCT) pegmatites, was made in the Adamello Massif, Italy. Gem-quality tourmalines had never been found before in the Alps, and this new pegmatitic deposit is of particular interest and worthy of a detailed characterization. We studied a suite of faceted samples by classical gemmological methods, and fragments were studied with Synchrotron X-ray computed micro-tomography, which evidenced the occurrence of inclusions, cracks and voids. Electron Microprobe combined with Laser Ablation analyses were performed to determine major, minor and trace element contents. Selected samples were analysed by single crystal X-ray diffraction method. The specimens range in colour from colourless to yellow, pink, orange, light blue, green, amber, brownish-pink, purple and black. Chemically, the tourmalines range from fluor-elbaite to fluor-liddicoatite and rossmanite: these chemical ...
... For instance, the logarithm of the stability constant K at 25°C of LnF2+ com plexes for zero ... more ... For instance, the logarithm of the stability constant K at 25°C of LnF2+ com plexes for zero ionicstrength (on decimal basis) ranges from about 3.60 (for La) or about 4 (for Ce) to 4.51 (for Lu ... 8 pegmatite, polycrase-(Y)(7) Trout Creek, CO, Clora May pegmatite, aeschynite-(Y)* ) ...
Eleven specimens of monazite from different occurence$ in fissures and pegmatites in the Alps hav... more Eleven specimens of monazite from different occurence$ in fissures and pegmatites in the Alps have been analyzed by electron microprobe. For some samples from pegma- tites, unit-cell data have been obtained. Fissure monazite is poorer in nonessential elemenls (Si, Ca, Y, Th, (.I) than monazite coming from pegmatites; tlle latter can in places be extraordinarily enriched in uranium and 1fusrirrm.
... beryl, three of bazzite, three of scandiobabingtonite-babingtonite, four of cascandite, five ... more ... beryl, three of bazzite, three of scandiobabingtonite-babingtonite, four of cascandite, five of thortveitite, and one of jervisite (all from the Baveno pluton); and ... The system was operated at an accelerating voltage of 20 kV, a sample current (on brass) of 10 nA, and a counting time ...
... VALERIA DIELLA Centro CNR per la Geodinamica alpina e quaternaria, Via Botticelli 23, I-20133... more ... VALERIA DIELLA Centro CNR per la Geodinamica alpina e quaternaria, Via Botticelli 23, I-20133 Milano, Italy ... These discoveries confirm the similarity between the Baveno and Cuasso al Monte occurrences, and suggest the possi-bility that scandium minerals are more ...
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