Mohs Scale was developed in 1812 by German mineralogist Friedrich Mohs
(1773-1839)
Mohs Scale of hardness is a RELATIVE scale, not proportional. I mean by this that a mineral with the hardness of 8 will NOT be twice as hard as a 4. (For example, diamond is 4X harder than sapphire!).It is really a scale of relative "scratchability".#1 is softest..................#10 is hardest
#1 | Talc |
#2 | Gypsum |
#3 | Calcite |
#4 | Fluorite |
#5 | Apatite |
#6 | Feldspar |
#7 | Quartz |
#8 | Topaz |
#9 | Corundum |
#10 | Diamond |
Gemstones and Mohs Scale
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Diamond:
.............10 |
Syth.
Moissanite:.......9.5 |
Corundum:
................9 |
Cubic
Zirconia:.. .8.5 |
Spinel:
........................8 |
Topaz:
.......................8 |
Emerald:
.......7.5 - 8 |
Almandite:
...............7.5 |
Rhodolite:
..........7 - 7.5 |
Pyrope:
........7 - 7.5 |
Spessartite:
...........7 - 7.5 |
Tourmaline:
........7 - 7.5 |
Iolite:
...........7 - 7.5 |
Quartz
Group: .............7 |
Peridot:
..............6.5 - 7 |
Jadeite:..
...6.5 - 7 |
Andradite:
.............6.5 - 7 |
Scapolite:
..............6.5 |
Zircon
(low): .......6.5 |
Tanzanite:
............6.5 - 7 |
Feldspars:
............6 - 7 |
Nephrite:.......6
- 6.5 |
Opal:
........................5.5 |
Lazulite:
...............5 - 6 |
Lapiz
Lazuli:.....5- 6 |
Turquoise:
..............5 - 6 |
Sphene:
.............5 - 5.5 |
Apatite:
...............5 |
Rhodochrosite:
............4 |
Coral
.....................3 - 4 |