stripes
This massif is an intrusion covering about 10 km2. It is formed of a single intrusive phase, which is represented by nepheline-kalsilite monzonites, essexites and medium- and fine-grained syenites. The main rock-forming minerals are nepheline, kalsilite, orthoclase, andesine, augite, aegirine-augite and biotite. The rocks were strongly affected by metasomatic processes involving addition of sodalite and albite.
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