BGS Rock Classification Scheme

Andesitic-rock, foliated

Code ANDRF
Description Andesitic-rock, foliated
Qualifiers foilated      
Definition Fine-grained, av.<0.25mm normal crystalline extrusive/intrusive rock; CI <35 vol% <40 wt%; qtz <20% or felspathoids <10% of QAPF, feldspar >65% plag; TAS SiO2 52-63wt%, Na2O+K2O <7wt% <5mm planar texture, preferred orientation of platy/prismatic minerals
Linked data http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/ANDRF

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.