European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 37, issue 5
Articles | Volume 37, issue 5
https://doi.org/10.5194/ejm-37-819-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-37-819-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 37, issue 5
Research article
 | 
23 Oct 2025
Research article |  | 23 Oct 2025

The M2(PO4)2Φ8 cyclic tetramer – a flexible structure-building unit – Part 1: Primary pegmatite phosphate minerals

Ian Edward Grey

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Short summary
The paper describes an analysis of the crystal structures of the minerals of the triphylite, alluaudite, zwieselite, and graftonite groups, from the perspective of the ubiquitous presence of 2-polyhedra-wide ribbons formed from corner linking of M2(PO4)2Φ8 cyclic tetramers. The study helps to unify the crystal chemistry of the four most dominant primary Fe and Mn phosphate mineral groups in granitic pegmatites.
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