If C is a color CrystGroup
whose color subgroup is lattice-equal (or
translationengleich) with C, the point group of C can consistently be
colored. In that case,
PointGroup( C )
returns a colored point group. Otherwise, the point group will be uncolored. An uncolored point group can always be obtained with
C.operations.UncoloredPointGroup( C )
GAP 3.4.4