BGS Rock Classification Scheme

Lava, augite-andesite

Code	AANDLV
Description	Lava, augite-andesite
Qualifiers	augite   andesite
Definition	Normal crystalline extrusive rock; CI <35vol%, <40wt%; quartz <20% or felspathoid <10% of QAPF, feldspar >65% plagioclase; TAS-SiO2 57-63wt%, Na2O+K2O <7wt%. 5-20vol% augite present. Extruded in molten state & solidified; grain size/texture not defined
Linked data	http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/AANDLV

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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.