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BGS Rock Classification Scheme

Quartzolite - A type of quartz-rich-coarse-grained-crystalline-rock. In the Rock Classification Scheme, it is a collective term for coarse-grained crystalline rocks in which quartz comprises more than 90% of the felsic minerals. These extremely rare rocks are unlikely to be wholly of primary igneous origin. British Geological Survey Research Report RR/99/06, section 5.1 and figs. 9, 11, 12.

Code QTZOLT
Description Quartzolite - A type of quartz-rich-coarse-grained-crystalline-rock. In the Rock Classification Scheme, it is a collective term for coarse-grained crystalline rocks in which quartz comprises more than 90% of the felsic minerals. These extremely rare rocks are unlikely to be wholly of primary igneous origin. British Geological Survey Research Report RR/99/06, section 5.1 and figs. 9, 11, 12.
Qualifiers No qualifiers currently exist.
Definition Coarse-grained, av. between 2-16mm normal crystalline intrusive rock; CI M<10%, quartz >90%, feldspar <10% of QAPF, +/- mica/amphibole
Linked data http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/QTZOLT

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.