Corundum

GPTKB entity

Predicate	Object
gptkbp:instance_of	gptkb:Iron_Age
gptkbp:chemical_formula	Al2 O3
gptkbp:has_color	gptkb:blue gptkb:green gptkb:red gptkb:yellow colorless
https://www.w3.org/2000/01/rdf-schema#label	Corundum
gptkbp:is_birefringent	gptkb:true
gptkbp:is_found_in	gptkb:kyanite gptkb:sapphirine gptkb:jewelry sedimentary rocks igneous rocks metamorphic rocks bauxite alumina deposits aluminum ore
gptkbp:is_hardness	9 on Mohs scale
gptkbp:is_opaque	false
gptkbp:is_used_in	gptkb:ceramics gptkb:jewelry electronics industrial applications jewelry making optical components cutting tools abrasives high-temperature applications gemstone cutting sapphire glass polishing compounds grinding wheels laser components watch crystals
gptkbp:is_visible_from	gptkb:true
gptkbp:mining_locations	gptkb:Australia gptkb:Brazil gptkb:India gptkb:Pakistan gptkb:Russia gptkb:Thailand gptkb:United_States gptkb:Vietnam gptkb:Sri_Lanka gptkb:Madagascar
gptkbp:varieties	gptkb:Diamonds gptkb:Ruby
gptkbp:bfsParent	gptkb:Diamonds
gptkbp:bfsLayer	4