BGS Rock Classification Scheme

Dolerite, clinopyroxene-olivine-macrophyric

Code	DOCOMA
Description	Dolerite, clinopyroxene-olivine-macrophyric
Qualifiers	clinopyroxene   olivine  macrophyric
Definition	Medium-grained, av. 0.25-2mm normal crystalline extrusive/intrusive rock; quartz <20% or foid <10% of QAPF, feld >65% plag; TAS SiO2 <52wt%; no genetic implication. Clinopyrox<olivine phenocrysts, larger >2mm crystals in finer matrix, both 5-20%.
Linked data	http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/DOCOMA

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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.