Neighborite
Chakhmouradian A R, Ross K, Mitchell R H, Swainson I
Physics and Chemistry of Minerals 28 (2001) 277-284
The crystal chemistry of synthetic potassium-bearing neighborite, (Na1-xKx)MgF3
Sample studied by X-ray diffraction, x = .18
_database_code_amcsd 0008542
5.4486 5.5101 7.7623 90 90 90 Pbnm
atom     x     y     z occ Biso
Na   .9911 .0244   .25 .82 2.09
K    .9911 .0244   .25 .18 2.09
Mg       0    .5     0      .94
F1   .0778 .4831   .25      1.4
F2   .7084 .2876 .0290     1.62