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The high-pressure (HP) structural evolution of a natural tetragonal edingtonite from Ice River, Canada, was investigated up to 5.1 GPa using in situ single-crystal X-ray diffraction and a diamondanvil cell. The isothermal equation of state was determined. The values of V 0 , K T0 , and K' refined with a third-order Birch-Murnaghan equation of state (BM-EoS) are V 0  = 601.6(3) Å 3 , K T0  = 59(2) GPa, and K' = 3.4(8). Under high-pressure conditions the main deformation mechanisms can be described by rotation/kinking of “rigid units,” represented by the 4 = 1 secondary building unit (SBU), due to the tetrahedra tilting. The angle between the SBUs (ϕ) increased from 17.15(8)° at 0.0001 GPa to 20.03(9)° at 4.61 GPa.

Isothermal equation of state and compressional behavior of tetragonal edingtonite