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COMPOSANTS DE PHASE ET ESPACE DE COMPOSITIONMinéraux limites ou Pôles d<strong>an</strong>s les grenatsCaldériteMn 3Fe 2Si 3O 12GrossulaireAndradite(Ca) 3Al 2Si 3O 12Ca 3Fe 2Si 3O 12Spessartine(Mn) 3Al 2Si 3O 12SciagiteFe 3Fe 2Si 3O 12Pyrope(Mg) 3Al 2Si 3O 12Alm<strong>an</strong>din(Fe) 3Al 2Si 3O 12GROUPE X3 Al2 MnMg -1 FeMg -1 CaMg -1GROUPE Ca3 Y2 FeAl -1 sites MGROUPE X3 Fe2 MnCa -1 FeCa -1GROUPE Fe3 Y2 FeAl -1 sites MGROUPE Mn3 Y2 FeAl -1 sites M