AM_Tridymite_7 Formula: Si O2 Name: Tridymite Unit cell: 25.919 5.004 18.54 90.0 117.72 90.0 , V=2128.64 Space group: A1A1 (9)

Hirose T , Kihara K , Okuno M , Fujinami S , Shinoda K , Journal of Mineralogical and Petrological Sciences , 100 (2005) p.55-69, X-ray, DTA and Raman studies of monoclinic tridymite and its higher, temperature orthorhombic modification with varying temperature., Locality: synthetic, Note: T = 373 K