AM_Tokkoite Formula: K1.85 Ca3.43 Ti.13 Na.15 Fe.15 Mn.08 Mg.06 Si7 O19.39 F.61 H1.39 Name: Tokkoite Unit cell: 10.438 12.511 7.112 89.92 99.75 92.89 , V=914.15 Space group: P-1 (2)

Rozhdestvenskaya I V , Nikishova L V , Lazebnik Yu D , Lazebnik K A , Zeitschrift fur Kristallographie , 189 (1989) p.195-204, The crystal structure of tokkoite and its relation to the structure of tinaksite, Locality: Murun massif, southwestern Yakutia, Russia, Note: anisotropic temperature factors taken from ICSD