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Figure 3
Planar polyoxometalate clusters in minerals shown in polyhedral (left) and skeletal (right) representations: the [(V5+O2)Al10–x(OH)20–2x(H2O)18–2x]11+ cluster in caseyite (a) and the [Cr3+8(OH)16(CO3)8]8− cluster in putnisite (b).

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 76| Part 4| August 2020| Pages 618-629
https://doi.org/10.1107/S2052520620007131
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