Ice goes fully cubic

@article{Salzmann2020IceGF,
  title={Ice goes fully cubic},
  author={Christoph G. Salzmann and Benjamin J. Murray},
  journal={Nature Materials},
  year={2020},
  volume={19},
  pages={586-587}
}
Two independent studies describe the discovery of structurally pure cubic ice Ic made from either ice XVII or a high-pressure hydrogen hydrate. 
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References

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TLDR
A method to obtain large quantities of cubic ice Ic with high structural purity is described and neutron diffraction experiments performed on two different instruments and Raman spectroscopy measurements confirm the structural purity of the cubic ice, Ic.
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Ice Ic, so-called 'cubic ice' (Konig 1943 Z. Kristallogr. 105 279–86), can be obtained, for example, from direct vapour deposition at low temperatures or by warming of recovered high-pressure forms
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X-ray diffraction data and Monte Carlo simulations show that ice that crystallizes homogeneously from supercooled water is disordered in one dimension and therefore possesses neither cubic nor hexagonal symmetry and is instead composed of randomly stacked layers of cubic and hexagonal sequences.
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A hydrogen hydrate and degas hydrogen is synthesized, obtaining pure non-defected cubic ice, observed by X-ray and neutron diffraction, and this discovery of ideal ice Ic will promote understanding of the role of stacking-disorder on the physical properties of ice as a counter end-member of ice Ih.
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TLDR
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Cubic Ice in Nature