- Can be formed from liquid water at 11 kbar by lowering the temperature to approx. -3 °C
- Density: 1.31 g/cm3
- Ice VI is a proton-disordered phase
- it is composed of two independent interpenetrating networks of H-bonded water molecules (shown above in blue and red, respectively)
- the main structural motif is a tricyclic, cage-like water hexamer, similar as in liquid water
- This motif is also found for the silicon atoms in the zeolite edingtonite, see here for comparison.
- The respective topology of the underlying net is edi, a binodal (4,4)-c net with transitivity pqrs = 2343
- Space group: P42/nmc (No. 137)
- Crystal system: Tetragonal
- Lattice parameters:
- a = b = 6.116(1) Å, c = 5.689(1) Å
- α = β = γ = 90°
 W. F. Kuhs, J. L. Finney, C. Vettier and D. V. Bliss, Structure and hydrogen ordering in ices VI, VII and VIII by neutron powder diffraction. J. Chem. Phys. 1984, 81, 3612-3623.
Here, you can download the CIF.
Atomistic structure figures were created with:
K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).