windows for satellites and spacecraft (because of its transparency in the ultraviolet to infrared range), and laser components. For example, the KAGRA gravitational wave detector's main mirrors are 50 lb sapphires, and Advanced LIGO considered 40 kg sapphire mirrors. Corundum has also found use in the development of ceramic armour thanks to its high hardiness.

Structure and physical properties

Corundum crystallizes with trigonal

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