https://motherboard.vice.com/en_us/article/mbdzn3/physicists-discover-how-an-exotic-form-of-ice-grows-at-over-1000-miles-per-hour

Research published earlier this month in Physical Review Letters suggests that an exotic phase of water, known as “ice VII” could form at grow at rates exceeding 1,000 miles per hour under the atmospheric conditions found on alien ocean worlds.

Water exists in three main phases (solid, liquid, and gas) and the phase it occupies is a function of atmospheric pressure and temperature. The solid form of water—ice—has several phases of its own, however most of them exist at extremely low temperatures (but some of them can exist at temperatures upwards of 1300 degrees fahrenheit so long as the pressure is high enough.ms.vice.com