Ordinary everyday ice, like the ice produced by a fridge, is known to scientists as hexagonal ice (ice Ih), and is not the only crystalline phase of water. More than 20 different phases are possible. One of them, called “superionic ice” or “ice XVIII,” is of particular interest, among other reasons, because it is thought to make up a large part of Neptune and Uranus, planets frequently referred to as “ice giants.”
Click here for original story, Superionic ice contributes to understanding of magnetic anomalies on Neptune and Uranus
Source: Phys.org