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27 December, 21:17

An unknown mineral scratches glass but will not scratch quartz. Which measure on the Mohs scale shows its hardness?

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  1. 27 December, 21:20
    0
    The best measure of the hardness of the mineral is orthoclase = 6.

    For glass, Mohs hardness = 5.5.

    For quartz, Mohs hardness = 7.

    The hardness of the mineral is somewhere in between.

    The best we can do is say that the hardness of orthoclase = 6.
  2. 27 December, 21:22
    0
    glass is on the Mohs scale 5.5 and quartz is a 7 so the number is 6
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