Commodity Code

halloysite

http://resource.geosciml.org/classifier/cgi/commodity-code/halloysite

definition Halloysite is a 1:1 aluminosilicate clay mineral with the empirical formula Al2Si2O5(OH)4. Its main constituents are aluminium (20.90%), silicon (21.76%) and hydrogen (1.56%). Halloysite typically forms by hydrothermal alteration of alumino-silicate minerals.[4] It can occur intermixed with dickite, kaolinite, montmorillonite and other clay minerals. more like this
notation
01.02.10.04 more like this
Hall more like this
source http://en.wikipedia.org/wiki/Halloysite more like this
type
Resource
Concept
broader clay
narrower halloysite
in scheme commodity code
is primary topic of halloysite