BGS Rock Classification Scheme

Ironstone - In the Rock Classification Scheme, all lithified iron-rich sedimentary rocks are given this group name. This is the lithified equivalent of iron-sediment. The textural classification of ironstones follows that for limestone. The classification of ironstones composed dominantly of one constituent similarly follows that for limestone. British Geological Survey Research Report RR/99/03, section 5.2 and fig. 9.

Code FEST
Description Ironstone - In the Rock Classification Scheme, all lithified iron-rich sedimentary rocks are given this group name. This is the lithified equivalent of iron-sediment. The textural classification of ironstones follows that for limestone. The classification of ironstones composed dominantly of one constituent similarly follows that for limestone. British Geological Survey Research Report RR/99/03, section 5.2 and fig. 9.
Qualifiers No qualifiers currently exist.
Definition Sedimentary rock (>15wt% iron), no recognisable depositional texture with particles >50% iron-bearing minerals (15wt% iron). Particle size not defined.
Linked data http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/FEST

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.