BGS Rock Classification Scheme

Hydroxides and oxides of alumina and iron - Their classification is based upon the state of hydration of the silicate minerals. British Geological Survey Research Report RR/99/03, section 9.2.

Code HYIA
Description Hydroxides and oxides of alumina and iron - Their classification is based upon the state of hydration of the silicate minerals. British Geological Survey Research Report RR/99/03, section 9.2.
Qualifiers No qualifiers currently exist.
Definition Material with >50% oxides/hydroxides of iron/aluminium, including hydrated aluminium silicates, Amount of lithification & particle size not defined but normally clay-grade <0.004mm.
Linked data http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/HYIA

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.