European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 34, issue 2
Articles | Volume 34, issue 2
https://doi.org/10.5194/ejm-34-215-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-34-215-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 34, issue 2
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, Peter Elliott, William Gus Mumme, Colin M. MacRae, Anthony R. Kampf, and Stuart J. Mills

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Latest update: 26 Jul 2025
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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.
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