AM_Tridymite_2 Formula: Si O2 Name: Tridymite Unit cell: 5.007 8.6004 8.2169 90.0 91.512 90.0 , V=353.71 Space group: C1C1 (9)

Graetsch H , Topalovic-Dierdorf I , European Journal of Mineralogy , 8 (1996) p.103-113, 29Si MAS NMR spectrum and superstructure of modulated tridymite L3-To(MX-1), Sample: average crystal structure