Ice III is a tetragonal crystalline ice, formed by cooling water down to 250 K at 300 MPa. It is the least dense of the high-pressure water phases, with a density of 1.16g/cm³ (at 350 MPa). The proton-ordered form of ice III is ice IX.

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 (2007-11-11). Ice-three and ice-nine structures. 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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