Potential answers for "Seven on the Mohs' scale"

⭐⭐⭐⭐ QUARTZ
⭐⭐⭐ OPAL
⭐⭐⭐ TALC
⭐⭐⭐ HARDER
⭐⭐⭐ APATITE
⭐⭐⭐ DIAMOND

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