Hi all
Does anyone know of a published crystal structure for millisite?
It is nominally (Na,K)CaAl6(PO4)4(OH)9·3H2O
Tetragonal, a=7, c=19.07 Å
See http://www.minsocam.org/ammin/AM45/AM45_547.pdf
or maybe anything possibly isostructural/morphous? It's pretty close to
wardite, but has an extra hy
Current (2023) knowledge, including main x-ray lines, is summarised on
https://www.mindat.org/min-2712.html
which also links to the extensive American Mineralogy database (which does
not include Millisite). If you have a clean sample, you may need neutrons
to distinguish it from similar hydrated mi
