= Fractional coordinates
{wiki=Fractional_coordinates}
Fractional coordinates are a way of expressing the positions of points in a crystal lattice or within a unit cell of a crystal structure. Instead of using absolute coordinates (like Cartesian coordinates in a specific unit of measurement), fractional coordinates are given as a fraction of the unit cell parameters. In a crystal lattice, the unit cell is the smallest repeating unit that defines the entire structure of the crystal.
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