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Aluminun OxyNitride. Close cousin to saphire (as it says in the article), Al2O3. Sapphire is sometimes used for (small) windows in hostile environments. Artificially grown sapphire panels have long been suggested for AFV windows.
I have two questions:
Is this a crystal or a amorphous solid (a glass)?
How does this material compare with opaque ceramic armors, like silicon carbide or aluminum oxide?
For starters, it is 10x as expensive as Lvl IV armor but somewhat more protective.