At temperatures above 1100 °C, kyanite decomposes into mullite and vitreous silica via the following reaction: 3(Al2O3·SiO2) → 3Al2O3·2SiO2 + SiO2.
Bei Temperaturen iwwer 1100 ° C kyanite decomposes an mullite an vitreous Silikatsubstrat via de folgende Reaktioun: 3 (Al2O3 · SiO2) → 3Al2O3 · 2SiO2 + SiO2.