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Are there minerals that can't scratch each other but have different hardness on Mohs scale?

The idea discussed in the paper you reference is about transferability of Mohs ordinal scale to true hardness. A mineral's ability to scratch is related to it's hardness, but only an indentation test ...
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Are there minerals that can't scratch each other but have different hardness on Mohs scale?

It may be difficult to ascertain the hardness of a mineral relative to an other mineral in a Mohs streak test if one (or both) are not homogeneous. Already a small local grain of an impurity may put ...
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