Characterization and Beneficiation of an Egyptian ...
The potash feldspar and sodic plagioclase (albite, An4) are the main constituents of the nepheline syenites (Figures 4 and 5).The potash feldspar is mainly the simple twinned orthoclase (KAlSi 3 O 8) which intergrows with the sodic plagioclase (albite) (NaAlSi 3 O 8) in the form of string and patchy perthitic intergrowths (Figure 5) The orthoclase perthite forms …
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