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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 scale of mineral hardness is referred to as the Mohs scale. They run from 1 which is Talc to 10, which is diamond. The other units are 2: Gypsum, 3: Calcite, 4: Fluorite, 5: Apatite, 6: Feldspar, 7: Quartz, 8: Topaz, and 9: Corundum.he most familiar to most pe â¦ ople would be the Mohs' scale. It is used to measure the hardness of stone on a non-linear scale from 1 to ten. Talc, the softest, is 1 and the hardest, diamond, is 10. It isn't linear because diamond is actually 42 times harder than talc, not 10 times.