Ice V

Ice V is monoclinic crystalline form of ice formed by cooling water to 253 K at 500 MPa. It has the most complicated structure of all the phases. The proton-ordered form of ice V is ice XIII.

Ordinary water ice is known as ice Ih, (in the Bridgman nomenclature). Different types of ice, from ice II to ice XIV, have been created in the laboratory at different temperatures and pressures.