Image: Crystallography Haüy integrant molecules form pentagonal dodecahedron of pyrite 1801
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Description: 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. Traité de Minéralogie. Paris: Louis, 1801.]
Title: Figure from Traité de minéralogie (1801)
Credit: Science History Institute
Author: Haüy, René Just, 1743-1822.
Permission: This file was provided to Wikimedia Commons by the Science History Institute as part of a cooperation project.
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