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Igneous rock | |
![]() Hand samples of nepheline syenite of the Ordovician Beemerville Complex, northern New Jersey | |
Composition | |
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Primary | alkali feldspar, nepheline, clinopyroxene, amphibole, biotite |
Secondary | magnetite, ilmenite, apatite, titanite |
Nepheline syenite is a holocrystalline plutonic rock that consists largely of nepheline and alkali feldspar.[1] The rocks are mostly pale colored, grey or pink, and in general appearance they are not unlike granites, but dark green varieties are also known. Phonolite is the fine-grained extrusive equivalent.
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