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

The β Tridymite (SiO₂) Structure (C10)

You can now

• see the structure from several perspectives;
• examine the structure with an external viewer; or
• download the coordinates of the atoms in these pictures in XYZ format.
• visualize the structure (Uses the JMOL Applet)

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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)

See these vectors in LaTeX output format.

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Structures indexed by: Strukturbericht Symbol Pearson Symbol Space Group Prototype

This is a mirror of an old page created at the Naval Research Laboratory Center for Computational Materials Science The 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).