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Unit 2.6 of the course The Fascination of Crystals and Symmetry Additonal resources at: Fractional coordinates are a convenient way of specifying where the atoms are located in the unit cell. Fractional coordinates make use of the crystallographic system of coordinates, meaning that the lattice vectors are used as a basis - and the absolute numerical values of the lattice constants equals unity, this means are set to 1. The atomic site parameters are then given as a coordination triple x, y, and z and these coordination values are fractional amounts of the lattice constants – a, b, and c. -------------- If you prefer books instead of videos, have a look at:
