Ice IV is a metastable rhombohedral phase of ice. It can be formed by heating high-density amorphous ice slowly at a pressure of 0.81 GPa. It does not easily form without a nucleating agent.

Ordinary water ice is known as ice I_h, (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.

References

• Chaplin, Martin (2007-07-01). Ice-four structure. Water Structure and Science. Retrieved on 2008-01-02.

v • d • e Crystalline forms of ice Ih • Ic • II • III • IV • V • VI • VII • VIII • IX • X • XI • XII • XIII • XIV • XV . XVI

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