Moh’s Scale of hardness |
Common material |
10 |
Diamond |
9 |
Corundum |
8 |
Topaz |
7 |
Quartz |
6 |
Orthoclase |
5.5 |
Glass, masonry nail |
5 |
Apatite |
4.5 |
Wire nail |
4 |
Fluorite |
3.5 |
Copper penny |
3 |
Calcite |
2.5 |
Fingernail |
2 |
Gypsum |
1 |
Talc |
A Mnemonic,
Tucson girls can flirt and only quit to chase dwarves.
The first letter of each word is the first letter of the
Moh's Hardness Scale
Talc Gypsum Calcite Fluorite
Apatite Orthoclase Quartz Topaz Corumdum
Diamond (Hardness scale 1-10 for minerals)