Vickers hardness number
Vickers hardness number (VHN) A quantitative measure of the hardness of ore minerals, that is used in their identification. A diamond is indented into a mineral under a predetermined load (usually 100 g), for a given time (usually 15s), and the cross-sectional area of the indentation is converted into a number, the Vickers hardness number.
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Vickers hardness number