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"The material, aluminium oxynitride, known as AION, is four times harder than fused silica glass, 85 per cent as hard as sapphire and stable up to a temperature
by billswift 15y ago
"The material, aluminium oxynitride, known as AION, is four times harder than fused silica glass, 85 per cent as hard as sapphire and stable up to a temperature of 1,200C."
Quote from the Daily Mail article linked above.