Summary: The transformation was followed in Amelia albite powders by variation in 2θ₁₃₁−2θ_13¯1 with time under isothermal conditions at various temperatures in the range 920°–1080°C. The activation energy of about 74 kcal mole^-1 is rather larger than that obtained for the ordering process in synthetic NaAlSi₃O₈ under hydrothermal conditions.