Rutile Doughnut Sixling
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EXAMP4
This "crystal" makes use of several tricks. Use point group "2", monoclinic, and axes 1 : 1 : 0.577, with BETA=90. This is not the true axial ratio of rutile, but is chosen so that the individuals just touch and do not overlap. The real forms which will be shown are {100} and {110}, but you must enter:

   1)    {100}    1.0
   2)    {010}    -1.0
   3)    {0-10}    3.0
   4)    {1-10}    2.4749
   5)    {110}    -0.3536
   6)    {001}    2.5

Note that the distances for forms 2) and 5) are negative - this causes the crystal to be drawn to the left of the center. The twins are type Contact, five successive rotations by 60 degrees about axis [100], with composition planes (011) and (01-1).