This is a handbook of formula used in crystallography covering such topics as the relations of vectors in the reciprocal lattice; the defining vectors for various crystal systems and transformations among them; structure factors for various lattices; quantities such as the angles between planes and the repeat spacing in reciprocal space for the seven Bravais lattices; and conversion factors for transforming one lattice system into another. The material is presented in a condensed, encyclopedic manner that will make it an excellent reference for researchers as well as graduate students just entering the field.