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We present the first equation of state and structure refinements at high pressure of single-crystal phase egg, AlSiO 3 OH. Phase egg is a member of the Al 2 O 3 -SiO 2 -H 2 O system, which contains phases that may be stable along a typical mantle geotherm ( Fukuyama et al. 2017 ) and are good candidates for water transport into Earth’s deep mantle. Single-crystal synchrotron X‑ray diffraction was performed up to 23 GPa. We observe the  b  axis to be the most compressible direction and the b angle to decrease up to 16 GPa and then to remain constant at a value of ~97.8° up to the maximum experimental pressure reached. Structure refinements performed at low pressures reveal a distorted octahedron around the silicon atom due to one of the six Si-O bond lengths being significantly larger than the other five. The length of this specific Si-O4 bond rapidly decreases with increasing pressure leading to a more regular octahedron at pressures above 16 GPa. We identified the shortening of the Si-O4 bond and the contraction of the vacant space between octahedral units where the hydrogen atoms are assumed to lie as the major components of the compression mechanism of AlSiO 3 OH phase egg.

High-pressure single-crystal structural analysis of AlSiO 3 OH phase egg