Potential answers for "It's a 9 on the Mohs scale"

⭐⭐⭐⭐ RUBY
⭐⭐⭐ OPAL
⭐⭐⭐ TALC
⭐⭐⭐ HARDER
⭐⭐⭐ APATITE
⭐⭐⭐ DIAMOND

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