BGS Rock Classification Scheme
Melilitic rock - A type of exotic crystalline igneous rock. In the Rock Classification Scheme, it is defined as a rock that contains more than 10% modal melilite. Although light-coloured, melilite is classified as a mafic mineral belonging to group M. Melilitic rocks are divided into ultramafic-melilitic-rock, and non-ultramafic-melilitic-rock. British Geological Survey Research Report RR/99/06, section 6.2 and figs. 27, 28.
| Code | MELR |
|---|---|
| Description | Melilitic rock - A type of exotic crystalline igneous rock. In the Rock Classification Scheme, it is defined as a rock that contains more than 10% modal melilite. Although light-coloured, melilite is classified as a mafic mineral belonging to group M. Melilitic rocks are divided into ultramafic-melilitic-rock, and non-ultramafic-melilitic-rock. British Geological Survey Research Report RR/99/06, section 6.2 and figs. 27, 28. |
| Qualifiers | No qualifiers currently exist. |
| Definition | Exotic crystalline intrusive rock, >10% modal melilite, +/-olivine/pyroxene, grain size not defined |
| Linked data | http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/MELR |
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.