goethite

English Thesaurus

1. a red or yellow or brown mineral; an oxide of iron that is a common constituent of rust (noun.substance)

hypernym	:	iron ore,
definition	:	an ore from which iron can be extracted (noun.substance)

substance meronym	:	rust,
definition	:	a red or brown oxide coating on iron or steel caused by the action of oxygen and moisture (noun.substance)