Abstract
A convenient program for drawing atomic arrangement in crystals has been written in BASIC. By the program, a, b or c-axis projection figure can be obtained for any space groups of crystals. Unit cell dimensions, atomic coordinates an an asymmetric unit, ionic radius of each atom and symmetry operation matrices are required for the drawing. Three modes of drawing projected along any crystal axis are possible such as 1) atom projection without erasing underlying circle-lines of atoms, 2) circular drawing of atoms by erasing underlying lines, and 3) spherical drawing of atoms. Quartz structure was shown for an example to explain how to use the program.
