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Figure 18
The `photogram' found for a (001) platelet of zinc sulfide (sphalerite). The symmetry elements are self-evident: the main axis is fourfold, while there are four twofold rotation axes (four planes of symmetry) (Friedrich et al., 1912BB18).

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