Mohs Hardness Scale
A scale of standards against which a mineral is compared. A hardness scale is based on experimentation and observation using natural or man-made materials. Since each of the materials has a consistent hardness, different workers can repeat and verify each other’s observations with agreement. Most mineralogists use the Mohs Hardness Scale, which is based on scratching as its mechanical force.
Friedrich Mohs, 1832
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"Mohs Hardness Scale", Ohio History Central, July 1, 2005, http://www.ohiohistorycentral.org/entry.php?rec=2212
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