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melteigite

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) 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. 25 Dec. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "melteigite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (December 25, 2009). http://www.encyclopedia.com/doc/1O13-melteigite.html

AILSA ALLABY and MICHAEL ALLABY. "melteigite." A Dictionary of Earth Sciences. 1999. Retrieved December 25, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-melteigite.html

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