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Figure 3
The (2b) structure type, observed in M2(PO4)X minerals, where M = Mg2+ and X = OH, F or M = Fe2+, Mn2+ and X = OH. Two distinct arc-like configurations of F/O atoms are labelled up (U) and down (D). The example represents synthetic hydroxylwagnerite Mg2(PO4)OH (Raade & Rømming, 1986BB54); hydrogen bonds (donor green, hydrogen black spheres) are shown as solid lines.

ISSN: 2052-5206
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