BGS Rock Classification Scheme

Granitic-rock, nebulose

Code	GNRN
Description	Granitic-rock, nebulose
Qualifiers	nebulose
Definition	Extreme variety of migmatitic rocks, contain ghostly relicts of pre-existing rocks. Granitic-rock protolith normal crystalline intrusive rock; quartz 20-60%, feldspar 40-80% of QAPF, feldspar, species not defined, +/- mica/amphibole.
Linked data	http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/GNRN

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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.