|
|
|
Diamond, C |
|
Corundum (Ruby, Sapphire), Al2O3 |
|
Topaz, Al2SiO4(OH,F)2 |
|
Quartz, SiO2 |
|
Feldspar, e.g., KAlSi3O8 |
|
Apatite, Ca5(PO4)3(OH,F) |
|
Fluorite, CaF2 |
|
Calcite, CaCO3 |
|
Gypsum, CaSO4-2H2O |
|
Talc, Mg3Si4O10(OH)2 |
|
FAMILIAR OBJECT |
|
Glass plate, knife blade |
|
Copper penny |
|
Fingernail |
You will be using a glass plate (H=5.5) most of the time. There are two ways to apply the test:
You can use a copper penny and your fingernail in
the
same way to determine the hardness of a mineral relative to H=3 and
H=2.5
respectively.