AM_Kupletskite_1
Formula: Mn6.169 Na.475 Mg.069 (Ti1.762 Nb.238) Si8 K Ca.199 O30 F.5 H4
Name: Kupletskite
Unit cell: 5.4022 23.226 21.1782 90.0 95.246 90.0 , V=2646.13
Space group: C12/C1 (15)

Piilonen P C , McDonald A M , Lalonde A E , The Canadian Mineralogist , 41 (2003) p.27-54, Insights into astrophyllite-group minerals II: Crystal chemistry, Sample: RUS9, nepheline syenite pegmatite, Locality: Lovozero massif, Kola Peninsula, Russia