BGS Rock Classification Scheme
Normal crystalline igneous rock - These are the chemically and/or mineralogically normal crystalline igneous rocks. In the Rock Classification Scheme, this class includes coarse-grained normal crystalline rock, medium-grained normal crystalline rock, and fine-grained normal crystalline rock. These comprise the vast majority of all crystalline igneous rocks. British Geological Survey Research Report RR/99/06, section 1.3 and fig. 1.
| Code | NCR |
|---|---|
| Description | Normal crystalline igneous rock - These are the chemically and/or mineralogically normal crystalline igneous rocks. In the Rock Classification Scheme, this class includes coarse-grained normal crystalline rock, medium-grained normal crystalline rock, and fine-grained normal crystalline rock. These comprise the vast majority of all crystalline igneous rocks. British Geological Survey Research Report RR/99/06, section 1.3 and fig. 1. |
| Qualifiers | No qualifiers currently exist. |
| Definition | Crystalline intrusive/extrusive rock, chemically & mineralogically normal, crystal size not defined, includes most of the volume igneous rocks |
| Linked data | http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/NCR |
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.