1. Talc- easily scratched by fingernail
2. Gypsum- can be scratched by fingernail
3. Calcite- barely can be scratched by a copper penny
4. Fluorite- easily scratched with steel file or glass
5. Apatite- can be scratched by steel file or glass
6. Feldspar- scratches glass, but does not scratch steel
7. Quartz- scratches both glass and steel
8. Topaz- scratches quartz
9. Corundum- scratches topaz
10. Diamond- scratches everything
11. I wonder if I'm going to be able to memorize this in an hour...
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