Ice V, pronounced "ice five", is a

monoclinic In crystallography, the monoclinic crystal system is one of the seven crystal systems. A crystal system is described by three vectors. In the monoclinic system, the crystal is described by vectors of unequal lengths, as in the orthorhombic s ...

crystalline phase of water, formed by cooling water to 253 K at 500

MPa MPA or mPa may refer to: Academia Academic degrees * Master of Performing Arts * Master of Professional Accountancy * Master of Public Administration * Master of Public Affairs Schools * Mesa Preparatory Academy * Morgan Park Academy * Moun ...

. It has a

density Density (volumetric mass density or specific mass) is the substance's mass per unit of volume. The symbol most often used for density is ''ρ'' (the lower case Greek letter rho), although the Latin letter ''D'' can also be used. Mathematicall ...

of 1.24 g cm³ (at 350 MPa). Ice V has a complicated structure, including 4-membered, 5-membered, 6-membered, and 8-membered rings and a total of 28

molecules A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds; depending on context, the term may or may not include ions which satisfy this criterion. In quantum physics, organic chemistry, and bioche ...

in the unit cell. Ganymede's interior probably includes a liquid water ocean with tens to hundreds of kilometers of ice V at its base.

References

Water ice {{inorganic-compound-stub