Phillipsite is really monoclinic and the true forms shown in this twin are {001}, {010} and {110}. It would take twenty-four individuals if it were done as contact twins - in this case it is easier to do it as penetration twins, and things are greatly simplified by using the cell dimensions and indices of the cubic twin pseudo-symmetry. Use crystal class B1, triclinic, with axes of length 1.0 and angles of 90 degrees, and input the following forms:
Use twin suboption Interpenetration - intercrystal edges. There are 5 twins, by rotations of 120 and 240 degrees about axes [111] and [11-1], and 90 degrees about [001].
Try reducing the central distance of the forms 3) through 6) gradually, to see the transition to a pseudo-dodecahedron with complete faces.