BGS Rock Classification Scheme

Microsyenogranite - A type of microgranite. In the Rock Classification Scheme, it is the medium-grained equivalent of syenogranite. British Geological Survey Research Report RR/99/06, section 5.1.

Code	MCSYGN
Description	Microsyenogranite - A type of microgranite. In the Rock Classification Scheme, it is the medium-grained equivalent of syenogranite. British Geological Survey Research Report RR/99/06, section 5.1.
Qualifiers	No qualifiers currently exist.
Definition	Medium-grained, av. between 0.25-2mm normal crystalline intrusive rock, quartz 20-60% of QAPF, feldspar 65-90% alkali feldspar; +/-mica/amphibole
Linked data	http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/MCSYGN

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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.