BGS Rock Classification Scheme

Amphibolite, schistose

Code	AMPSCH
Description	Amphibolite, schistose
Qualifiers	schistose
Definition	Crystalloblastic metamorphic rock (grain size & protolith undefined); 35-90% mafic minerals, hornblende+plagioclase dominant +/-garnet/biotite/quartz. Splits into <5mm slabs/flakes defined by well-developed planar orientation of platy/prismatic minerals.
Linked data	http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/AMPSCH

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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.