This paper deals with crystal growth of berlinite crystals in hydrothe
rmal conditions. It is devoted to the hydrothermal crystal growth of b
erlinite in acid media, in the temperature range 150-300 degrees C, fa
r pressures less than 30 Mpa. This study was completed by the epitaxia
l growth of berlinite on quartz seeds. The OH content of the obtained
crystals was evaluated by IR spectrometry.