As observed in Table 3 , there is a clear trend for the precipitation of calcium-rich crystalline phases, such as diopside (MgCaSi 2 O 6 ; PCPDF 98-002-1772), wollastonite (CaSiO 3 ; PCPDF 98-002-1772) or devitrite (Na 2 Ca 3 Si 6 O 16 ; PCPDF 98-004-6279) as the content in P 2 O 5 decreases.
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