Commonwealth Countries United Kingdom Ghana Kenya Malawi Rhodesia Sierra Leone Tanzania Uganda Zambia Canada...29 Figure 4 Nepheline-syenite occurrences in Malawi page 51 Figure 5 Occurrences of nepheline-bearing...Sphene(Titanite) CaTiSiO, Ilmenite FeTiO, Zircon Zr,SiO, Eudialyte (Eucolite) (Na,CaFe),Zr(OH,CI)(SiO,), Catapleiite...diagram of the system SiO.-NaAlSiO,-KAISiO, with region of low temperature indicated by stippled area....most nepheline-syenites lie in the low-melting region (adjacent to R) of the silica-deficient area, while