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We have determined the equation of state of phase Egg, AlSiO 3 OH, at room temperature up to 40 GPa, using X-ray powder diffraction with synchrotron radiation. We determined the isothermal bulk modulus K 0T  = 157 ± 4 GPa with a pressure derivative K' 0T  = 6.5 (4) by fitting a third order Birch- Murnaghan equation of state. When K' 0T  is fixed at 4, we obtain K 0T  = 183 ± 2 GPa. This value can be compared to other hydrous phases existing in the transition zone as well as to non-hydrous phases, such as kyanite, Al 2 SiO 5 . We find that despite the presence of hydrogen, the bulk modulus of phase Egg remains high, unlike other low-pressure hydrous minerals. In addition, we found that phase Egg is more compressible along the b axis, where the O-H bonds are oriented. Our results are in good agreement with previous theoretical calculations, performed on the similar hydrous phase δ-AlOOH, that show that the O-H bond strengthens with pressure, suggesting that the presence of water stored in these phases does not soften the material at pressures corresponding to lower mantle conditions.

Compressibility of phase Egg AlSiO 3 OH: Equation of state and role of water at high pressure