Crystal Lattice Structures: Creation Date:  5 Jul 2000 Last Modified: 21 Oct 2004

# The β Tridymite (SiO2) Structure (C10)

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• Prototype: β Tridymite (SiO2)
• Pearson Symbol: hP12
• Strukturbericht Designation: C10
• Space Group: P63/mmc (Cartesian and lattice coordinate listings available)
• Number: 194
• Primitive Vectors:  A1 = ½ a X - ½ 3½ a Y A2 = ½ a X + ½ 3½ a Y A3 = c Z
• Basis Vectors:  B1 = 1/3 A1 + 2/3 A2 + ¼ A3 = ½ a X + 12 -½ a Y + ¼ c Z (O-I) (2c) B2 = 2/3 A1 + 1/3 A2 + ¾ A3 = ½ a X - 12-½ a Y + ¾ c Z (O-I) (2c) B3 = 1/3 A1 + 2/3 A2 + z A3 = ½ a X + 12-½ a Y + z c Z (Si) (4f) B4 = 2/3 A1 + 1/3 A2 - z A3 = ½ a X - 12-½ a Y - z c Z (Si) (4f) B5 = 2/3 A1 + 1/3 A2 + (½ + z) A3 = ½ a X - 12-½ a Y + (½ + z) c Z (Si) (4f) B6 = 1/3 A1 + 2/3 A2 + (½ - z) A3 = ½ a X + 12-½ a Y + (½ - z) c Z (Si) (4f) B7 = ½ A1 = ¼ a X - ¼ 3½ a Y (O-II) (6g) B8 = ½ A2 = ¼ a X + ¼ 3½ a Y (O-II) (6g) B9 = ½ A1 + ½ A2 = ½ a X (O-II) (6g) B10 = ½ A1 + ½ A3 = ¼ a X - ¼ 3½ a Y + ½ c Z (O-II) (6g) B11 = ½ A2 + ½ A3 = ¼ a X + ¼ 3½ a Y + ½ c Z (O-II) (6g) B12 = ½ A1 + ½ A2 + ½ A3 = ½ a X + ½ c Z (O-II) (6g)

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 Structures indexed by: This is a mirror of an old page created at theNaval Research LaboratoryCenter for Computational Materials ScienceThe maintained successor is hosted at http://www.aflowlib.org/CrystalDatabase/ and published as M. Mehl et al., Comput. Mater. Sci. 136 (Supp.), S1-S828 (2017).