Mohs Hardness Scale
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The Mohs hardness scale for minerals has been used since 1822. It simply consists of 10 minerals arranged in order from 1 to 10. Diamond is rated as the hardest and is indexed as 10; talc as the softest with index number 1. Each mineral in the scale will scratch all those below it as follow
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Apatite |
5 |
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Fluorite |
4 |
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Calcite |
3 |
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Gypsum |
2 |
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Talc |
1 |