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Molecular formula : MW : CAS :
nature : mineral hardness said a standard. 1824 by the German HL Moss (Frederich Mohs) first. Application will be scratching pyramid-shaped needle outlined by the tougher test of the surface and mineral occurrence scratch. Using the measured depth of the scratch hardness said : Talc (talc) 1 (minimum hardness), gypsum (GYPSUM) 2, calcite (calcite) 3, fluorite (fluorite) 4, apatite (CA) 5, is feldspar (feldspar; Orthoclase; Periclase ) 6, quartz (quartz) 7, Topaz (topaz) 8, corundum (corundum) 9, diamond (diamond) 10. Mok's hardness also said for other solid material's hardness.
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