stripes
Shvanidzorskii is situated in the southeastern part of the Megrinskii granitoid pluton and is confined to a fracture zone striking northwest. The massif consists of three intrusive phases (1) medium-grained melanocratic and mesocratic peralkaline syenites, (2) pegmatitic leucocratic syenites and (3) fine-grained nepheline syenites. There are also olivine-bearing gabbros of the essexite-theralite family. The most common rocks are the pegmatitic leucocratic syenites, which account for 85% of the intrusion. The principal rock-forming minerals are orthoclase-microperthite, oligoclase, nepheline, biotite and aegirine with accessory minerals including sodalite, monazite, pyrochlore, fluorite, cancrinite, calcite, ilmenite, apatite, zircon, titanite, baddeleyite and tourmaline. Fenitization of the country rocks (Devonian volcanics and diorites) is widely developed.
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