Contracts: Piotr MacioĊ‚ AGH University of Science and Technology email: pmaciol@agh.edu.pl 0.0 1.0 0.0 1.0 0.0 1.0 has_grain_atoms can "have" voids instead of particular atoms (missing atoms in crystal lattice) e.g. perlite grain has grains of cementite and ferrite Al Cr Cu Fe Mg Mn Si Ti Zn Fe 0.5 Mn 0.4 1 Si 0.7 1.3