Neptheline Syenite, Magmatic, Mt St Hilaire, Quebec Nepheline syenite is a holocrystalline plutonic rock that consists largely of nepheline and alkali

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Neptheline Syenite, Magmatic, Mt St Hilaire, Quebec Nepheline syenite is a holocrystalline plutonic rock that consists largely of nepheline and alkali feldspar.

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Photo credit: © Phil Degginger / Alamy / Afripics
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Keywords: alkali, alkaline, coarse-grained, differentiation, feldspar, feldspathoid, feldspathoid-rich, hilaire, holocrystalline, igneous, intrusive, magmatic, mineral, mineralogy, mt, nepheline, neptheline, plutonic, quebec, rare, rock, silica-undersaturated, specimen, st, syenite, type