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In crystallography, a Wyckoff position is a point belonging to a set of points for which site symmetry groups are conjugate subgroups of the space group. Crystallography tables give the Wyckoff positions for different space groups. Wyckoff positions are used in calculations of crystal properties. There are two types of positions: general and special. *General positions are left invariant only for the identity operation (''E''). Each space group has only one general position. *Special positions are left invariant by the identity operation and at least one other operation of the space group. ==External links== * (American Mineralogical Society Crystal Structure Database ) * (Bilbao Crystallographic Server ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Wyckoff positions」の詳細全文を読む スポンサード リンク
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