This intergrowth consists of two different orientations of albite crystals, but the input for the crystals themselves is exactly the same. The crystal class is B1 and the axes are a=0.63 b=1.0, c=0.56, ALPHA=94, BETA=116 and GAMMA=88. The forms are:
1) {110} 1.0
2) {001} 1.4
3) {-101} 1.4
4) {010} 0.1
After entering the first or main crystal, select Epitaxial Crystals, and in this case you can simply click on the Duplicate button. After the new entry appears in the list, select that entry and click on Revise. For orientation, specify face (010), vector [001] for the host and face (0-10), vector [00-1] for the guest. Choose type Interpenetration, and give 0.2 for the center-center Distance. Note that the vector for the guest is the negative of that for the host; this results in a 180 degree rotation about the normal to the common face, which is the definition of a "normal" twin, and exactly equivalent to reflection in the face. It is not necessary to revise any of the data for the epitaxial crystal itself (Revise... buttons).
Returning to the dialog with the list of epitaxial crystals you can again just duplicate the last crystal and Revise the new crystal. This time, use face (0-10) for the host and (010) for the guest (the vectors remain the same), so that the new crystal will be on the back side of the host. The center-center distance is the same, 0.2.
Next, add another pair of epitaxial crystals on front and back - (010) and (0-10) of the host - at distance 0.4. However, for this pair, use the same vector, [001], for the guest and the host; this pair is thus in parallel, not twin, orientation with the original crystal. This could go on forever, but the intergrowth shown has just one more crystal, with the twin orientation, at distance 0.6.
Intercrystal edges may be left unchecked, but you must Remove Hidden Lines (Display menu).