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    Mohs scale

    Related product
    A scale for determining the relative hardness of a mineral according to its resistance to scratching by one of the minerals in the table below.


    Mineral Hardness
    talc Mg3Si4O10(OH)2 1
    gypsum CaSO4·2H2O 2
    calcite CaCO3 3
    fluorite CaF2 4
    apatite Ca5(PO4)3(OH-,Cl-,F-) 5
    orthoclase KAlSi3O8 6
    quartz SiO2 7
    topaz Al2SiO4(OH-,F-)2 8
    corundum Al2O3 9
    diamond C 10


    The scale was devised by Friedrich Mohs (1773–1839).


    Related category

       • GEOLOGY AND PLANETARY SCIENCE





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