Wikipedia: History of Mohs scale of mineral hardness

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:::A simple search on Google shows there is an 'absolute hardness' scale; in fact, there appear to be at least two: the Rosiwal absolute hardness scale; and the Knoop absolute hardness scale. Also, how can a non-existent scale yield real numbers like the ones in this article (although I've more commonly seen 140000 for Diamond, not the 1500 given above; I suppose this might be the Rosiwal vs. Knoop scales.) -- SJK

	Revision 10 . . November 6, 2001 12:32 pm by (logged).111.13.xxx [comments on claim 'absolute hardness scale' doesn't exist]
	Revision 9 . . November 6, 2001 11:42 am by (logged).144.199.xxx [Answered question]