Head noun: corundum

Same concepts
http://dbpedia.org/resource/Corundum

Narrower concepts

labelprovenanceconfidence
aluminum oxideisap:2913225940.501137
sapphireisap:574251740.226263
rubyisap:4558731060.178333
emeryisap:2973877420.115891
micaisap:4571541750.085661