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10 Diamond
9 Corundum (rubies and sapphires)
8

Topaz

7 Quartz [Example: It scratches window glass]
6 Feldspar [Example: A steel file will scratch it]
5 Apatite
4 Fluorite Example: A knife will scratch it]
3 Calcite [Example: A copper coin will scratch it]
2 Gypsum
1 Talc [Example: A fingernail will scratch it]
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