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Moh's Scale of Hardness

	1. Talc
	2. Gypsum	Can be scratched with a finger nail
	3. Calcite
	4. Fluorspar
	5. Apatite
	6. Orthoclase	Can be scratched with a penknife
	7. Quartz
	8. Topaz
	9. Corundum
	10. Diamond

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