BGS Rock Classification Scheme

Calcsilicate-rock, gneissose

Code CALSGN
Description Calcsilicate-rock, gneissose
Qualifiers gneissose      
Definition Meta-carbonate protolith. Grain size undefined; calc-silicate >50%; (+/-diop/epid/gross/Ca-amphib/titan/uvar/wollast/vesuvan/Ca-plag (>50%An)/forst/phlog) +carbonate mins <50%. >5mm irregular/discontinuous contrasting layers, preferred min orientat common
Linked data http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/CALSGN

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.