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2. Hardnesses of the elements (data page) - Wikipedia

   en.wikipedia.org/wiki/Hardnesses_of_the_elements...

   number symbol name Mohs hardness [1] Vickers hardness ... gold: 2.5: 188–216: 188–245: 189 80: Hg: ... Mohs scale of mineral hardness; Mohs hardness of materials ...

3. Mohs scale - Wikipedia

   en.wikipedia.org/wiki/Mohs_scale

   Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale The Mohs scale ( / m oʊ z / MOHZ ) of mineral hardness is a qualitative ordinal scale , from 1 to 10, characterizing scratch resistance of minerals through the ability of harder material to scratch softer material.

4. Spinel - Wikipedia

   en.wikipedia.org/wiki/Spinel

   Polyhedral representation of spinel MgAl 2 O 4. Spinel (/ s p ɪ ˈ n ɛ l, ˈ s p ɪ n əl / [7]) is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula MgAl 2 O 4 in the cubic crystal system. Its name comes from the Latin word spinella, a diminutive form of spine, in reference to its pointed crystals. [5]

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7. Scratch hardness - Wikipedia

   en.wikipedia.org/wiki/Scratch_hardness

   [3] [4] The Mohs scale is based on relative scratch hardness of different materials; with talc assigned a value of 1 and diamond assigned a value of 10. [5] Mohs's scale had two limitations: it was not linear, and most modern abrasives fall between 9 and 10.; [ 6 ] [ 7 ] so, later scientists attempted to increase resolution at the harder end of ...