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What two scales are used to determine the hardness of a mineral and what is the difference between the two?

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What two scales are used to determine the hardness of a mineral and what is the difference between the two?

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  1. Rock well and Brinell. The Rock well uses for hardened material.We denote it by R.C. It will have a diamond tip in its edge.While applying certain fixed force the penetration depth gives the measurement directly. The brinell is having a hardened ball in its tip. While applying a fixed force the ball makes an impression on the material tested.The diameter of that mark is measured and compared with the chart to get the result.


  2. Mohs

    Rockwell

    Vickers

    Brinell

    They all have articles on http://www.wikipedia.org
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