AM_Nagashimalite Formula: Ba4 (V3.44 Ti.56) Si8 B2 O29 Cl H.44 Name: Nagashimalite Unit cell: 13.937 12.122 7.116 90.0 90.0 90.0 , V=1202.21 Space group: PMMN (59)

Matsubara S , Mineralogical Journal , 10 (1980) p.131-142, The crystal structure of nagashimalite, Ba4(V(3+),Ti)4[(O,OH)2|Cl|Si8B2O27], Locality: Mogurazawa mine, Kirya City, Gumma Prefecture, Japan