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Trachyte Andes ite Syenite Diorite Felspar & horn- blende Felspar <k horn- blende Basic 55-45% Tachy- lyte Basalt, diorite Gabbro Felspar & augite Ultra-basic Below 45% Picrite, peridotite Olivine, etc. Clarke found that felspars constitute 60 per cent, of the