Table 3-2:
TABLE 3-2: Mohs Scale of Hardness
Mineral
Scale Number
Common Objects
Talc
1
Gypsum
2
Fingernail
Calcite
3
Copper coin
Fluorite
4
Apatite
5
Knife blade
Orthoclase
6
Window glass
Quartz
7
Steel file
Topaz
8
Corundum
9
Diamond
10