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A mineralâs hardness is related to the strength of its weakest bond, and minerals may have different hardnesses in different directions. For example, kyanite has a hardness of 5.5 if scratched lengthwise, but a hardness of 6.5 if scratched crosswise (numbers in Mohs scale). Since covalent bonds are stronger than ionic bonds, minerals in which covalent bonds dominate will be harder than those in which ionic bonds are prevalent.
the softest a mineral can be is a 2 and the hardest it can be is a 9, it is a scale of 2-9 Another Answer The Mohs Scale of hardness ranges from 1 to 10. You can read more abâ¦out it, below. The Mohs scale of mineral hardness is based on the ability of one natural sample of matter to scratch another.