AM_Metanatrolite_4 Formula: Na1.74 Al2 Si3 O10 Name: Metanatrolite Unit cell: 16.736 17.622 6.4649 90.0 90.0 90.0 , V=1906.64 Space group: F112 (5)

Baur W H , Joswig W , Neues Jahrbuch fur Mineralogie, Monatshefte , 1996 (1996) p.171-187, The phases of natrolite occurring during dehydration and rehydration studied, by single crystal X-ray diffraction methods between room temperature and 923 K, Locality: Khibiny, Kola peninsula, Russia, Sample: T = 773 K, crystal II, metanatrolite