Corundum - Crystalline Aluminium Oxide (Al2O3) is a mineral that is hard (9.0 on Mohs scale) and used as an abrasive.
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No, a mineral is a hard substance
Very soft mineral
easy
Mineral hardness is measured by how resistant one mineral is to being rubbed against another. If the mineral displays clear abrasion then it has low hardness whereas if it displays little abrasion it is a hard mineral.
It's pretty freakin hard!