Figure 11. Melting diagram for the system nephelines-diopsides-apatite, after [Kogarko, 1990]. Di - diopside, Ap - apatite, Pho - Ca-phosphate, Mel - melilite, Cg - carnegieite, Ne - nepheline, Ol - olivine, L1 + L2 - immiscibility region. Point A signifies the weighted mean composition for the Kovdor-type primary alkaline ultramafic magma, and point A1 , the hypothetical composition for the primary magma of the Khibiny-type alkaline ultramafic series.