11. Over the existing crepido a new stylobate of syenite blocks was placed. 12. Inside the city proper are six syenite hills,. 13. Rock types include trachyandesite, trachyte, syenite and amphibole-biotite granite. 14. It is essentially a microcline, sodalite and cancrinite variety of nepheline syenite . 15. Nepheline syenite provides geological clues to environment of formation. 16. Connected with the borolanite there are other types of nepheline syenite and pegmatite. 17. Rocks from the Cretaceous include syenite porphyry sills and dykes near Cygnet around. 18. It was first described by mineralogist and geographer dike of nepheline syenite composition. 19. It is called nepheline syenite gneiss or litchfieldite. 20. On the other hand, nepheline syenite gneiss contains abundant and large zircon crystals.
