| 11. | One gneiss fragment found as a xenolith contains corundum.
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| 12. | Accessory phases include titanite, apatite, corundum, zircon, magnetite and ilmenite.
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| 13. | It is a silky brown form of corundum.
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| 14. | The inhabitants of Liangzhu, using these tools, worked corundum into ceremonial axes.
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| 15. | The jewel material is usually some form of synthetic corundum, such as ruby.
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| 16. | Corundum for abrasives is mined in Zimbabwe, Russia, Sri Lanka, and India.
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| 17. | Minerals that often display parting include the pyroxenes, hematite, magnetite, and corundum.
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| 18. | It is typically seen in workers involved in the smelting of bauxite to produce corundum.
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| 19. | :Rubies are a type of Corundum.
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| 20. | It occurs commonly as an alteration product of corundum, andalusite and other aluminous minerals.
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