BGS Rock Classification Scheme

Natrocarbonatite - A type of carbonatite. In the Rock Classification Scheme, this term may be used when a modal classification is possible. A natrocarbonatite is composed essentially of sodium, potassium and calcium carbonate minerals. British Geological Survey Research Report RR/99/06, section 6.1 and fig. 25.

Code NACBT
Description Natrocarbonatite - A type of carbonatite. In the Rock Classification Scheme, this term may be used when a modal classification is possible. A natrocarbonatite is composed essentially of sodium, potassium and calcium carbonate minerals. British Geological Survey Research Report RR/99/06, section 6.1 and fig. 25.
Qualifiers No qualifiers currently exist.
Definition Exotic crystalline intrusive/extrusive rock, >50% modal primary carbonates dominantly of calcium/sodium/potassium, grain size not defined
Linked data http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/NACBT

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.