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The '''Mohs hardness scale''' for minerals has been used since 1822,<ref>http://www.gordonengland.co.uk/hardness/mohs.htm</ref> having been devised by [[Friedrich Mohs]] in 1812. 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 above it as follows:
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#[[Talc]]
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#[[Gypsum]]
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#[[Calcite]]
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#[[Fluorite]]
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#[[Apatite]]
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#[[Feldspar]]
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#[[Quartz]]
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#[[Topaz]]
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#[[Corundum]]
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#[[Diamond]]
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==Reference==
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<references/>
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[[Category:Geology]]
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[[Category:Minerals]]
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