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, R.-J. <i>Traité de Minéralogie.</i> Paris: Louis, 1801.]
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Haüy, René Just, 1743-1822.</div>
1801<div style="display: none;">date QS:P571,+1801-00-00T00:00:00Z/9</div>
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