BGS Rock Classification Scheme

Lamproite - A type of exotic crystalline igneous rock. There is no universally accepted definition for lamproites, however they occur characteristically as lavas, pipes and dykes. Some lamproites have a fragmental origin (i.e. they are volcaniclastic). In the Rock Classification Scheme they are classified on the predominance of phlogopite, richterite, olivine, diopside, sanidine and leucite. British Geological Survey Research Report RR/99/06, section 6.5.

Code LMPT
Description Lamproite - A type of exotic crystalline igneous rock. There is no universally accepted definition for lamproites, however they occur characteristically as lavas, pipes and dykes. Some lamproites have a fragmental origin (i.e. they are volcaniclastic). In the Rock Classification Scheme they are classified on the predominance of phlogopite, richterite, olivine, diopside, sanidine and leucite. British Geological Survey Research Report RR/99/06, section 6.5.
Qualifiers No qualifiers currently exist.
Definition Exotic crystalline intrusive rock 5-90vol% of phenocrystic Ti-phlog/poikilitic Ti-tetraferriphlog/richter/foresteritic ol/diop/Fe-leuc/Fe-sanidine. No primary plag/mel/monticell/kals/neph/Na-feld/sodal/nosean/hauyne/melan/schorlom/kimzey, molar K2O/Na2O>3
Linked data http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/LMPT

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.