https://mineralfyi.com/mineral/ferri-fluoro-katophorite/
Ferri-fluoro-katophorite, Na(NaCa)(Mg4Fe3+)(Si7Al)O22F2 — MineralFYI
Ferri-fluoro-katophorite (Na(NaCa)(Mg4Fe3+)(Si7Al)O22F2). Properties, classification, and identification guide.
ferrifluorokatophoritenaca