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Now showing items 65 - 68 of 68

  • PARTE PRIMA: GIURISPRUDENZA COSTITUZIONALE E CIVILE || Sezione III civile; sentenza 7 giugno 1974, n. 1718; Pres. La Farina P., Est. Auriti, P. M. Minetti (concl. conf.); Santoro (Avv. A. Tabet, Borghi) c. Micca (Avv. G. Fanelli, Morelli)

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  • ROLE OF CHROMIUM ACCUMULATION IN THE RELATIONSHIP BETWEEN AIRBORNE AND URINARY CHROMIUM IN WELDERS

    MUTTI, A   CAVATORTA, A   PEDRONI, C   BORGHI, A   GIAROLI, C   FRANCHINI, I  

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  • Multiple electron beam analyses applied to eclogite from the Western Alps

    Borghi, A   Agnella, D   Belluso, E   Cossio, R   Ruffini, R  

    The occurrence of compositional and microtextural relies within metamorphic rocks can provide useful information on the pressure-temperature history of the host rock. The grain-size of these microstructures, such as coronitic reaction microtextures, is mostly too fine to be detected by optical microscopy, Therefore, a more detailed analytical approach is needed. In this paper multiple electron beam techniques including the acquisition of X-ray multi-element maps, micro and nano-analysis performed by SEM/EDS and TEM/STEM-EDX systems were applied to a specific petrological problem related to metamorphism. Fine-grained decompressional reaction microtextures of an eclogitic sample (Mt. Rosa Nappe, Western Alps) are described and discussed.
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  • Chemical investigation of coloured minerals in natural stones of commercial interest

    Vaggelli, G   Olmi, F   Massi, M   Giuntini, L   Fedi, M   Fiora, L   Cossio, R   Borghi, A  

    The economic interest in natural stones provides an interesting input to the study of coloured rock-forming minerals. Generally, the colour of a mineral is attributed either to the presence of intrinsically-coloured constituents or of trace elements substituting major elements in the crystallographic sites, or to physical factors such as crystal lattice defects. We have analysed the blue and blue-green silicate minerals dumortierite and amazonite, coming from Mozambique quartzites, and from Malawi and Brazil granitoids, respectively. This study was performed by a multiple analytical approach including (a) a comparison of different signals (optical light-polarized images, backscattered electron images and X-ray multielemental maps); and (b) a collection of quantitative data obtained by WDS systems for major elements, and by WDS and/or micro-PIXE facility for trace elements. A good correlation between Ti concentration zoning and pleochroism variations was observed in dumortierite. In addition, the blue dumortierite of Mozambique, with its unusual significant amounts of antimony (about 5 wt.% Sb2O3), represents a mineral with an intermediate composition between dumortierite and holtite. In amazonite the aquamarine colour seems to be related to the Pb content on the order of some hundreds of ppm.
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