BGS Rock Classification Scheme
Pegmatite - A type of coarse-grained normal crystalline rock. In the Rock Classification Scheme, the term pegmatite is used for veins comprised of coarse or very coarse crystals. The term is used with qualifiers to describe component minerals in increasing abundance, for example biotite-quartz-feldspar pegmatite. British Geological Survey Research Report RR/99/06, section 8.1.
| Code | PEG |
|---|---|
| Description | Pegmatite - A type of coarse-grained normal crystalline rock. In the Rock Classification Scheme, the term pegmatite is used for veins comprised of coarse or very coarse crystals. The term is used with qualifiers to describe component minerals in increasing abundance, for example biotite-quartz-feldspar pegmatite. British Geological Survey Research Report RR/99/06, section 8.1. |
| Qualifiers | No qualifiers currently exist. |
| Definition | Regions of very coarse, (grain size >16mm) crystals of any composition, commonly of the same rock type in veins, vugs or void filling |
| Linked data | http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/PEG |
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.