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Figure 1
Compositional diagrams showing the two groups of phosphate minerals with the formula M2(PO4)X, where M = Mg2+, Fe2+, Mn2+ and X− = F, OH. Red lettering indicates structure type.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 70| Part 2| March 2014| Pages 243-258
doi:10.1107/S2052520613031247
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