Potential answers for "Corundum, for one"

⭐⭐⭐⭐ OXIDE
⭐⭐⭐⭐ MINERAL
⭐⭐ RUBY
⭐⭐ EMERY
⭐⭐ SAPPHIRE
⭐⭐ ALUMINA
⭐⭐ HARD

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