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Figure 3
Three-dimensional tetrahedral fractal representation of multiply twinned crystals ([\bar43m]) inherited from the same primary crystal [\alpha^0] (in green), viewed (a) in the [111] direction and (b) in the [[\bar1\bar1\bar1]] direction of [\alpha^0] (the two directions are not equivalent because a tetrahedron is not centrosymmetric). This fractal is built from twinned tetrahedra reduced in size by a factor of two at each generation and lying in the centres of the faces of the tetrahedra of the preceding generation. Distinct colours are associated with the orders n of the fractal.

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ISSN: 2053-2733
Volume 63| Part 1| December 2007| Pages 11-29
doi:10.1107/S0108767306044291
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