BGS Rock Classification Scheme

Leucogranite, pegmatitic

Code	GNLP
Description	Leucogranite, pegmatitic
Qualifiers	pegmatitic
Definition	Normal crystalline intrusive rock, av. 2-16mm. lighter than average, M<5%; quartz 20-60% of QAPF, feldspar 35-90% alkali feldspar +/- mica/amph. Regions of very coarse, >16mm crystals of any composition, commonly leucogranite in veins/vugs/void filling.
Linked data	http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/GNLP

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CAVEAT

"Thumbnail" definitions attached to some of the table entries are an interim attempt to provide simple short descriptions of the "unqualified" rock types presented within the BGS Rock Classification Scheme. Every effort has been made to ensure accuracy and consistency but minor contradictions or omissions might be present. The BGS welcomes any feedback pointing out such minor imperfections and/or providing constructive comment and suggestions for improvement of the definitions. In the first instance such feedback should be directed to Dr Tim McCormick.