Ice is famously anomalous ― unlike most I solids, in its usual form it is less dense than liquid water. In fact, regular ice has so far been found to come in at least 13 different forms. Furthermore, many types of amorphous ice, without the regular molecular structure of normal ice, have been discovered. Writing in Physical Review Letters, Finney et al. describe the structure of a new, very dense form of ice, whose existence has profound implications for many aspects of research into amorphous ice and other solids, and for our understanding of the phase diagram of water and ice.
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