Alumina: Difference between revisions

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Alumina is the chemical $A l_{2} O_{3}$ . It occurs naturally as hexagonal crystals called corundum, the second hardest mineral on Earth.^[1]

The hardness of corundum by definition 9 on Mohs' scale and it has a white streak, vitreous lustre and specific gravity between 4.0 and 4.1^[1]. It is used as an abrasive and the production of refractory.

References

↑ ^1.0 ^1.1 Field guide to rocks and minerals of Southern Africa - B. Cairncross. 2004. ISBN 978-1-86872-985-2

[Cairncross-1] 1.0 ^1.1 Field guide to rocks and minerals of Southern Africa - B. Cairncross. 2004. ISBN 978-1-86872-985-2

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