BGS Rock Classification Scheme

Gabbroic-rock, appinitic

Code	GBRA
Description	Gabbroic-rock, appinitic
Qualifiers	appinitic
Definition	Coarse-grained, av. between 2-16mm normal crystalline intrusive rock; quartz <20% or felspathoids <10% of QAPF, feldspar >65% plagi (>50% An) +/- mica/pyroxeneolivine. With coarse-grained euhedral hornblende in anhedral to poikilitic feldspar matrix.
Linked data	http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/GBRA

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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.