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melteigite

A Dictionary of Earth Sciences | 1999 | 477 words | Copyright

melteigite An undersaturated, intrusive igneous rock containing essential nepheline and alkali pyroxene (aegirine or aegerine-augite) and displaying a colour index of 70–90. With decreasing mafic mineral content and increasing nepheline content melteigites pass into ijolites and then into urtites. All three rock types are essentially feldspar-free, undersaturated syenites (see SILICA SATURATION) and are well displayed in the Fen intrusive complex of southern Norway.

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AILSA ALLABY and MICHAEL ALLABY. "melteigite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>.

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