Articles | Volume 34, issue 2
Eur. J. Mineral., 34, 215–221, 2022
https://doi.org/10.5194/ejm-34-215-2022
Eur. J. Mineral., 34, 215–221, 2022
https://doi.org/10.5194/ejm-34-215-2022
Research article
07 Apr 2022
Research article | 07 Apr 2022

Redefinition of angastonite, CaMgAl2(PO4)2(OH)4 ⋅ 7H2O, as an amorphous mineral

Ian Edward Grey et al.

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Cited articles

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Elliott, P., Grey, I. E., and Willis A. C.: Redefinition of the formula for aldermanite, [Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH,F)6] H2O, and its crystal structure, Mineral. Mag., 85, 348–353, 2021. 
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Short summary
A reinvestigation of angastonite from the type locality has shown that it is a mixture of crystalline phases and an amorphous phase, with the published formula corresponding to the amorphous phase. A redefinition proposal for angastonite as an amorphous mineral was approved by the IMA CNMNC. Our study showed how the amorphous phase formed and how it progressively recrystallises as new crandallite-related minerals.