BGS Rock Classification Scheme

Lime-microstone - A type of limestone, classified on the basis of its diagenetic texture. It is similar to lime-sparstone but with crystals smaller than 4 µm. Crystals are not resolvable under an optical microscope. British Geological Survey Research Report RR/99/03, section 3.1, table 3 and fig. 6.

Code LMMCST
Description Lime-microstone - A type of limestone, classified on the basis of its diagenetic texture. It is similar to lime-sparstone but with crystals smaller than 4 µm. Crystals are not resolvable under an optical microscope. British Geological Survey Research Report RR/99/03, section 3.1, table 3 and fig. 6.
Qualifiers No qualifiers currently exist.
Definition Sedimentary rock with crystals >50% calcite/aragonite, petrological study shows obliterative sparry calcite <0.004mm in inequant blocky mosaics. Crystals sub-microscopic.
Linked data http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/LMMCST

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.