AM_Metanatrolite_3 Formula: Na1.82 Al2 Si3 O10 Name: Metanatrolite Unit cell: 16.575 17.427 6.461 90.0 90.0 90.0 , V=1866.28 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 = 723 K, crystal II, metanatrolite