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<p>[QUOTE=&quot;desertgem, post: 7604081, member: 15199&quot;]Moh made his scale in 1822 and basically used only common minerals&nbsp; as the scale was for use by mineralogists. Obviously cotton is not a mineral so it is not on the Moh scale, however, it has hardness since it isn&#039;t a liquid, thus the &quot;extrapolation&quot; . As I mentioned this subject came up a while back&nbsp; and I did not keep the urls. Moh&#039;s scale is always mentioned as evidence that a diamond is the hardest mineral, but mineralogy has identified and even created new compounds harder than diamonds. All&nbsp; were not known or suspected in 1822, but modern technology has allowed us to find, analyze, and even create these new mineral materials.&nbsp; ( the article below is one that pops up, but you can search many others.</p><p><br /></p><p><a href="https://www.forbes.com/sites/davidbressan/2021/03/31/scientists-create-crystal-stronger-than-diamond/?sh=122eca533d89" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.forbes.com/sites/davidbressan/2021/03/31/scientists-create-crystal-stronger-than-diamond/?sh=122eca533d89" rel="nofollow">https://www.forbes.com/sites/davidbressan/2021/03/31/scientists-create-crystal-stronger-than-diamond/?sh=122eca533d89</a></p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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