AM_Nenadkevichite_1 Formula: Na1.09 (Ti.7 Nb.3) Si2 O8.85 H4 Name: Nenadkevichite Unit cell: 7.35 14.153 7.124 90.0 90.0 90.0 , V=741.07 Space group: PBAM (55)

Rastsvetaeva R K , Chukanov N V , Pekov I V , Doklady Akademii Nauk SSSR , 357 (1997) p.364-367, Crystal structure of a new mineral - titanium analog of orthorhombic, nenadkevichite