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any of various forms of aluminum oxide occurring naturally as corundum alumina , aluminium oxide , aluminum oxide
hard grey-black mineral consisting of corundum and either hematite or magnetite; used as an abrasive (especially as a coating on paper) emery
dark granular corundum emery
transparent deep red variety of corundum; used as a gemstone and in lasers ruby
precious transparent stone of rich blue corundum valued as a gemstone sapphire
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