Articles | Volume 34, issue 2
Eur. J. Mineral., 34, 215–221, 2022
Eur. J. Mineral., 34, 215–221, 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.

Related authors

Halilsarpite, a new arsenate analogue of walentaite, from the Oumlil mine, Bou Azzer district, Morocco
Tomas Husdal, Ian E. Grey, Henrik Friis, Fabrice Dal Bo, Anthony R. Kampf, Colin M. MacRae, W. Gus Mumme, Ole-Thorstein Ljøstad, and Finlay Shanks
Eur. J. Mineral., 32, 89–98,,, 2020
Short summary

Related subject area

New minerals and systematic mineralogy
Arrojadite-group nomenclature: sigismundite reinstated
Frank de Wit and Stuart J. Mills
Eur. J. Mineral., 34, 321–324,,, 2022
Short summary
Redefinition of beraunite, Fe3+6(PO4)4O(OH)4  ⋅  6H2O, and discreditation of the name eleonorite: a re-investigation of type material from the Hrbek Mine (Czech Republic)
Luboš Vrtiška, Jaromír Tvrdý, Jakub Plášil, Jiří Sejkora, Radek Škoda, Nikita V. Chukanov, Andreas Massanek, Jan Filip, Zdeněk Dolníček, and František Veselovský
Eur. J. Mineral., 34, 223–238,,, 2022
Short summary
Liguowuite, WO3, a new member of the A-site vacant perovskite type minerals from the Panzhihua–Xichang region, China
Yuan Xue, Ningyue Sun, Hongping He, Aiqing Chen, and Yiping Yang
Eur. J. Mineral., 34, 95–108,,, 2022
Short summary
Zinkgruvanite, Ba4Mn2+4Fe3+2(Si2O7)2(SO4)2O2(OH)2, a new ericssonite-group mineral from the Zinkgruvan Zn-Pb-Ag-Cu deposit, Askersund, Örebro County, Sweden
Fernando Cámara, Dan Holtstam, Nils Jansson, Erik Jonsson, Andreas Karlsson, Jörgen Langhof, Jaroslaw Majka, and Anders Zetterqvist
Eur. J. Mineral., 33, 659–673,,, 2021
Short summary
Kahlenbergite KAl11O17, a new β-alumina mineral and Fe-rich hibonite from the Hatrurim Basin, the Negev desert, Israel
Biljana Krüger, Evgeny V. Galuskin, Irina O. Galuskina, Hannes Krüger, and Yevgeny Vapnik
Eur. J. Mineral., 33, 341–355,,, 2021
Short summary

Cited articles

Billinge, S. J. L.: Nanoscale structural order from the atomic pair distribution function (PDF): there's plenty of room in the middle, J. Solid State Chem., 181, 1695–1700, 2008. 
Bridge, P. J. and Hey, M.: Georgeite, a new amorphous copper carbonate from the Carr Boyd Mine, Western Australia, Mineral. Mag., 43, 97–98, 1979. 
Debye, P.: Dispersion of Roentgen rays, Ann. Phys., 46, 809–823, 1915. 
Elliott, P., Peisley, V., and Mills, S. J.: The phosphate deposits of South Australia, Aust. J. Mineral., 17, 3–32, 2013. 
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. 
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.