Ice XI
low-temperature, orthorhombic ice, H2OIce IX is the low-temperature, ordered version of normal, hexagonal ice, known as ice Ih.
Note: This crystal structure is actually of D2O (deuterium oxide, i.e. heavy water, 2H2O) at 5 K (−268 °C).
J. Chem. Phys. (1985) 82, 424–428
Professor Martin Chaplin:
Water Structure and Science: ice-eleven
Wikipedia:
Ice
Ice XI
Ice crystals
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