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In the common Mohs hardness scale used in geology, 10 is the maximum number, the hardness of diamond.
There are several other hardness scales such as Vickers, and Brinell; but these have specialist engineering (not geologic) applications.
In brief, Brinell 28 would be rather soft - about that of copper. In Vickers, this number would represent something even softer - around that of gold.
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