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We report the synthesis, at 7 GPa and 923 K, and the thermoelastic characterization, up to 16 GPa and 850 K, of a single crystal of Mg-sursassite, Mg 5 Al 5 Si 6 O 21 (OH) 7 . In situ high-pressure and high-temperature single-crystal diffraction allowed the study of structural variation at non-ambient conditions and the determination of bulk elastic properties. The refined parameters of a second-order Birch-Murnaghan equation of state (BM-II EoS) are  V  0  = 446.02(1) Å 3  and  K  T0  = 135.6(7) GPa. The thermal expansion coefficients of a Berman-type EoS are α 0  = 3.14 (5) × 10 −5  K −1 , α 1  = 2.50(16) × 10 −8  K −2 , and  V  0  = 445.94(3). For comparison, the  P - V  EoS is determined for a natural sursassite sample, ideally Mn 4 Al 6 Si 6 O 22 (OH) 6 . The refined parameters of BM-II EoS [ V  0  = 470.2(3) Å 3 ,  K  T0  = 128(4) GPa] indicate that composition has a minimal effect on elastic properties. The similarity of density and bulk properties of Mg-sursassite if compared to olivine and other anhydrous mantle minerals suggests that this phase could be overseen by geophysical methods.

Thermoelastic parameters of Mg-sursassite and its relevance as a water carrier in subducting slabs