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 |