![The Mohs Stone Hardness Scale [Infographic] | Ian Knapper](https://www.ianknapper.com/wp-content/uploads/2017/01/mohs-stone-hardness-scale-700x3465.png "The Mohs Stone Hardness Scale [Infographic] | Ian Knapper")
The Mohs Stone Hardness Scale [Infographic] | Ian Knapper
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