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We investigated the grain growth kinetics of synthetic pure anorthite aggregates. The starting material was prepared from glass and has a homogeneous starting grain size of 3–4 μm. Porosity was less than 1% and the dislocation density was less than 2 × 10 7 cm −2 . The samples were subsequently annealed at temperatures between 1100°C and 1350°C in air from 10 min to 480 h. Grain size was determined optically. We observed normal grain growth for anneals less than 24 h. The grain growth exponent n varied between 2.5–2.7 for different temperatures. We determined the activation energy for grain growth to be 365 ± 25 kJ/mol. Microstructural observations show a decrease in aspect ratio of the grains from 2.8 to 1.7 with increasing annealing temperatures and duration.