BGS Rock Classification Scheme

Granofels - A type of metamorphic rock with unknown protolith based on textural attributes. It lacks any obvious foliation and layering and is commonly characterised by a granoblastic texture. A granofels can occur at any metamorphic grade with a range of lithologies. Note that orthogranofels indicates a rock that is thought to have an igneous protolith, and paragranofels indicates a rock that is thought to have a sedimentary protolith. British Geological Survey Research Report RR/99/02, sections 3.3, 6.1 and fig. 1.

Code GRNFEL
Description Granofels - A type of metamorphic rock with unknown protolith based on textural attributes. It lacks any obvious foliation and layering and is commonly characterised by a granoblastic texture. A granofels can occur at any metamorphic grade with a range of lithologies. Note that orthogranofels indicates a rock that is thought to have an igneous protolith, and paragranofels indicates a rock that is thought to have a sedimentary protolith. British Geological Survey Research Report RR/99/02, sections 3.3, 6.1 and fig. 1.
Qualifiers No qualifiers currently exist.
Definition Granoblastic textured metamorphic rock (grain size, mineralogy, protolith undefined) lacking any obvious foliation, qualifier essential; replaces granulite
Linked data http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/GRNFEL

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.