First, generate the host magnetite crystal, in group M3M, cubic. The forms used on this crystal were:
1) {111} 1.0
2) {110} 1.17
3) {211} 1.3
Now select Epitaxial crystals (Input1 menu). Click on the Add button. Now enter the data for the guest hematite crystal.
For the Type, enter Contact.
Next enter the orientation. Fill in the indices in the boxes in the center of the Epitaxial Relations dialog; the epitaxial face of the host, (1 1 1); the alignment vector in that plane, [-1 -1 2] (this vector points directly toward the apex): the epitaxial face of the guest hematite crystal, (0 0 -1); and the alignment vector in that face, [1 1 0] (this may not be correct, but it looks good).
For the Distance, which in the case of contact intergrowths is the central distance of the epitaxial face on the epitaxial crystal, enter 0.06 (actually, anything less than the central distance of the normal (001) face, 0.1, would do). The Translations should be zero, although you can later move the epitaxial crystal around with these items.
The data on the epitaxial crystal itself are entered with the Revise Title/Axes, Revise Symmetry and Revise Forms buttons towards the bottom of the Epitaxial Relations dialog, which bring up the same dialogs as for the main crystal. These buttons are the only way to enter or revise data for epitaxial crystals, and you must enter appropriate values in each dialog.
The crystal class is B3M, trigonal hexagonal, and the axes are 1.0 and 1.3. The forms are:
1) {2-23} 0.31
2) {101} 0.33
3) {001} 0.1
Note that these central distances fix the relative sizes of the two crystals, although you can change the size of the epitaxial crystal with the Rescale button.