The hardness of a mineral refers to its ability to resist scratching. A special
scale called Mohs' Scale of Hardness is used as a measure for determining hardness. This
scale consists of ten specific minerals, each given a number from 1 to 10. 1 is the softest,
and 10 is the hardest. The ten minerals and their hardnesses are: talc (1), gypsum (2),
calcite (3), fluorite (4), apatite (5), orthoclase (6), quartz (7), topaz (8), corundum (9),
and diamond (10).
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