BGS Rock Classification Scheme

Basaltic-rock, hornfelsed

Code	HBAR
Description	Basaltic-rock, hornfelsed
Qualifiers	hornfelsed
Definition	Basaltic-rock protolith recrystallised by contact metamorphism to a hard rock lacking parting planes. Was <0.25mm grained normal crystal in-/extrusive rock; CI >35 vol% >40 wt%; qtz <20% or feldspathoid <10% of QAPF, feld >65% plagioclase; TAS SiO2 <52wt%
Linked data	http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/HBAR

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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.