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Figure 15
The simplified `stereographic projection' of Gadolin for the homohedral forms of the cubic system: the small triangles and quadrangles symbolize rotation axes of order 3 and 4, respectively, the ellipses mirror planes (source: Gadolin, 1871BB9). Each of the 32 crystal `classes' has such a specific `stereogram' of its own to characterize its outward symmetry.

ISSN: 2053-2733
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