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Figure 3
The piling of the cubic `integrant molecules' which forms the pentagonal dodecahedron of pyrite. Notice the decrescence of the molecular lamellae in the proportion of 2:1, which leads to an interfacial angle at pq of 126° 52′ 12″, closely corresponding to that of the empirical crystal, viz 127° 56′ 08″ (Haüy, 1801BB11, Atlas).

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