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Line 1: − 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: − #[[Talc]] − #[[Gypsum]] − #[[Calcite]] − #[[Fluorite]] − #[[Apatite]] − #[[Feldspar]] − #[[Quartz]] − #[[Topaz]] − #[[Corundum]] − #[[Diamond]] − − ==Reference== − − <references/> − − [[Category:Geology]] − [[Category:Minerals]]
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