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Figure 6
The `lattices' (réseaux) of the tetrahedral molecules of boracite that constitute either a cube, (a), or a tetrahedron, (b) (Delafosse, 1843BB7). A packing such that there would result a dodecahedron of pentagons appears to be impossible.

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ISSN: 2053-2733
Volume 68| Part 1| December 2012| Pages 3-29
doi:10.1107/S0108767311030315
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