Abstract
A computer software package, CRYSTAL UTILITY, is presented for the description of crystals. CRYSTAL UTILITY includes the programs for drawing crystal structures, calculating x-ray powder diffraction intensities, calculating lattice constants of a crystal using the least-square method and drawing crystal shapes. These programs are written in a BASIC language using the NEC PC-9801 series personal computer. One who is not necessarily a specialist in crystallography can use CRYSTAL UTILITY without a special knowledge of a computer or a computer language.
