BGS Rock Classification Scheme
Tephritic-leucitite - A type of leucitite. In the Rock Classification Scheme, this rock plots in field 15b on the quartz - alkali feldspar - plagioclase - feldspathoid (QAPF) diagram; foids constitute 60 to 90% of light-coloured constituents; plagioclase is dominant over alkali feldspar. British Geological Survey Research Report RR/99/06, sections 5.2, 6.6.
| Code | LUCTPH |
|---|---|
| Description | Tephritic-leucitite - A type of leucitite. In the Rock Classification Scheme, this rock plots in field 15b on the quartz - alkali feldspar - plagioclase - feldspathoid (QAPF) diagram; foids constitute 60 to 90% of light-coloured constituents; plagioclase is dominant over alkali feldspar. British Geological Survey Research Report RR/99/06, sections 5.2, 6.6. |
| Qualifiers | No qualifiers currently exist. |
| Definition | Fine-grained, av. <0.25mm porphyritic textured normal crystalline intrusive rock with phenocrysts of leucite, dominant/only felspathoid; feldspathoids 60-90% of QAPF, feldspar >50% plagioclase, +/-mica/pyroxene |
| Linked data | http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/LUCTPH |
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.