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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.
MOHS SCALE OF HARDNESS. The MOHS Hardness Scale starts with talc at 1 being the softest mineral and ending with diamond at 10 being the hardest mineral. It is universally used around the world as a way of distinguishing minerals. Simply put: the higher the number, the harder the mineral. 10.