BGS Rock Classification Scheme
Ferrocarbonatite - A type of carbonatite. In the Rock Classification Scheme, this term may be used when a chemical classification is necessary because the rock is too fine grained for an accurate mode to be determined, or if the carbonate minerals are complex Ca-Mg-Fe solid solutions. The definition of ferrocarbonatite is as shown in British Geological Survey Research Report RR/99/06, section 6.1 and figs. 25, 26. See also: ferroan-carbonatite.
| Code | FEOCBT |
|---|---|
| Description | Ferrocarbonatite - A type of carbonatite. In the Rock Classification Scheme, this term may be used when a chemical classification is necessary because the rock is too fine grained for an accurate mode to be determined, or if the carbonate minerals are complex Ca-Mg-Fe solid solutions. The definition of ferrocarbonatite is as shown in British Geological Survey Research Report RR/99/06, section 6.1 and figs. 25, 26. See also: ferroan-carbonatite. |
| Qualifiers | No qualifiers currently exist. |
| Definition | Fine grained, av. between 0.032-0.25mm exotic crystalline intrusive/extrusive rock >50% modal primary carbonates or complex Ca-Mg-Fe carbonates; CaO <90wt%, Fe-Mn oxides >10wt%, MgO <50wt% of Ca+Mg+Fe+Mn oxides; chemical wt% oxide classification |
| Linked data | http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/FEOCBT |
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.