AM_Tridymite_8 Formula: Si O2 Name: Tridymite Unit cell: 26.163 4.987 8.199 90.0 90.0 90.0 , V=1069.76 Space group: P212121 (19)

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 = 413 K