AM_Tsepinite-Na Formula: Na1.09 K.44 O32.44 Ba.08 Sr.2 Fe.02 (Ti2.2 Nb1.8) Si8 H11.94 Name: Tsepinite-Na Unit cell: 14.604 14.274 7.933 90.0 117.4 90.0 , V=1468.17 Space group: C1M1 (8)

Rastsvetaeva R K , Organova N I , Rozhdestvenskaya I V , Shlyukova Z V , Chukanov N V , Doklady Chemistry , 371 (2000) p.52-56, Crystal structure of oxonium mineral of the nenadkevichite-labuntsovite group, from Khibiny massif, Locality: Khibinpakhchorr mountain, Khibiny massif, Kola Peninsula, Russia