Mohs Scale of Relative Mineral Hardness

Friedrich Mohs (1773-1839) was a mineralogist who devised this ascending scale,

from the softest (talc) to the hardest (diamond). (Gold is between 2½ and 3.)

1........TALC

2......GYPSUM

3.....CALCITE

4....FLUORITE

5.....APATITE

6....FELDSPAR

7......QUARTZ

8.......TOPAZ

9....SAPPHIRE

10....DIAMOND

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