BGS Rock Classification Scheme

Gneiss, k-feldspar-augen

Code	GNSKA
Description	Gneiss, k-feldspar-augen
Qualifiers	k-feldspar   augen
Definition	Med-coarse-grained (av. 0.25-16mm) crystalloblastic metamorphic rock (protolith undefined) >5mm irreg layers of contrasting grain size/mineralogy, preferred min orientation common, folia wrap round eyeshaped/lensoid min/aggregates, dominantly K-feldspar
Linked data	http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/GNSKA

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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.