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1. Water Ice

   Linked via "cubic Ice I$_c"

   Polymorphism and High-Pressure Phases
   Water ice exhibits the highest number of known solid phases of any common substance, exceeding 17 confirmed high-pressure polymorphs, in addition to the standard hexagonal Ice I$h and the metastable cubic Ice I$c.
   The transition between these phases is not always straightforward. Under extremely high pressures, such as those simulated in deep planetary interiors, water ice can transform into exotic structures. For example, [Ice VII…