BGS Rock Classification Scheme

Gabbroic-rock, hornfelsed

Code GBRH
Description Gabbroic-rock, hornfelsed
Qualifiers hornfelsed      
Definition Hard granoblastic rock, grains 0.032-2mm recrystallised by contact metamorphism, no parting planes, pre-existing features seen as lithological heterogeneities. Protolith gabbroic-rock quartz <20% or felspathoids <10% of QAPF, feldspar >65% plag (>50% An).
Linked data http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/GBRH

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.