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Corundum: Use as a Gemstone, Abrasive, Refractory - Geology.com
The Mohs Hardness Scale and Chart for Select Gems
Corundum | Properties, Formation, Uses » Geology Science
The Mineral corundum - The Mineral and Gemstone Kingdom
Corundum | Formula, Properties & Application
Mohs Hardness Scale: Testing the Resistance to Being Scratched
What is Corundum and What are its Basic Qualities?
Corundum - Minerals Education Coalition
Intriguing minerals: corundum in the world of rubies and
Basic Data on Corundum - Rausser College of Natural Resources
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