Data type: char
May appear in a looped list containing '_exptl_crystal_id'
Related item: '_exptl_crystal_colour'
Related function: alternate
The enumeration list of standardized names developed for the International Center for Diffraction Data. The colour of a crystal is given by the combination of _exptl_crystal_colour_modifier with _exptl_crystal_colour_primary, as in 'dark-green', 'bluish-violet', if necessary combined with _exptl_crystal_colour_lustre, as in 'metallic-green'.