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• W4383197007 abstract "Study of inclusions in gems from secondary deposits can give valuable clues on the geologic (and sometimes geographic) origin of these displaced materials. For the present study, seven gem quality fancy-coloured sapphires from Songea, Tanzania, were selected with, rarely observed in these gems, garnet inclusions in order to better understand their formation. Therefore, Raman spectroscopy was used to study garnet, as well as rutile, aluminosilicate and mica inclusions. Garnet composition calculations were made using the MIRAGEM Raman spectra software, which was further improved for the purpose of this study. A couple of garnet inclusions were also analysed by energy dispersive X-ray spectroscopy (EDS) attached to a scanning electron microscope (SEM). All garnet inclusions presented similar Raman spectra, thus similar chemical composition. Chemical analysis demonstrates that these are pyrope-rich (>40%) garnets with over 30% of almandine and over 20% grossular without any detectable titanium, chromium and sodium. Calculations made using the updated/improved MIRAGEM software were able to indicate the same composition as compatible with the obtained chemical analyses. Muscovite and sillimanite were also identified using micro-Raman spectroscopy. This inclusion scene is not similar to those described in fancy-coloured gem sapphires from other localities. The exact geological formation of these gems is yet not understood but might be eclogite or upper mantle related." @default.
• W4383197007 created "2023-07-06" @default.
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• W4383197007 date "2023-07-05" @default.
• W4383197007 modified "2023-09-30" @default.
• W4383197007 title "Disambiguation of pyrope‐rich garnet inclusions in coloured sapphires from Tanzania and identification of other inclusions by Raman spectroscopy" @default.
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• W4383197007 doi "https://doi.org/10.1002/jrs.6570" @default.
• W4383197007 hasPublicationYear "2023" @default.
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