A commonly used scale of relative hardness of minerals. 1. Talc. 2. Gypsum. 3. Calcite. 4. Fluorite. 5. Apatite. 6. Feldspar. 7. Quartz. 8. Topaz. 9. Corundum. 10. Diamond.
Copyright (C) 2012 Interweave Press, LLCUse of this site signifies your agreement to the Terms and Privacy Policy, updated March 2007