Hexagonal (6) Space Groups

Steven Dutch, Natural and Applied Sciences, University of Wisconsin - Green Bay
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To the right of each space group is a listing of coordinate points. These are the coordinates to which a general point (x,y,z) is transformed by the space group. Origins (called "equivalent points" in the International Tables), are additional points around which the points are transformed. For example, (0,0,0) refers to a corner of the unit cell, (1/2,1/2,1/2) to the center. All space groups have origin (0,0,0). For a space group with an additional origin (1/2,1/2,1/2), point (x,y,z) is also transformed to (1/2+x,1/2+y,1/2+z) and so on.

3-fold and 6-fold coordinates are tabulated with respect to axes intersecting at 60 degrees. In this oblique coordinate system, coordinates tend to be simple

168-p6.gif (2424 bytes) 168     P6

(+x, +y, +z); (-y, +x-y, +z); (+y-x, -x, +z);
(-x, -y, +z); (+y, +y-x, +z); (+x-y, +x, +z);

169-p6i.gif (2205 bytes) 169     P61

(+x, +y, +z); (-y, +x-y, 1/3+z); (+y-x, -x, 2/3+z);
(-x, -y, 1/2+z); (+y, +y-x, 5/6+z); (+x-y, +x, 1/6+z);

170-p6q.gif (2183 bytes) 170     P65

(+x, +y, +z); (-y, +x-y, 2/3+z); (+y-x, -x, 1/3+z);
(-x, -y, 1/2+z); (+y, +y-x, 1/6+z); (+x-y, +x, 5/6+z);

171-p6j.gif (2258 bytes) 171     P62

(+x, +y, +z); (-y, +x-y, 2/3+z); (+y-x, -x, 1/3+z);
(-x, -y, +z); (+y, +y-x, 2/3+z); (+x-y, +x, 1/3+z);

172-p6p.gif (2298 bytes) 172     P64

(+x, +y, +z); (-y, +x-y, 1/3+z); (+y-x, -x, 2/3+z);
(-x, -y, +z); (+y, +y-x, 1/3+z); (+x-y, +x, 2/3+z);

173-p6k.gif (2341 bytes) 173     P63

(+x, +y, +z); (-y, +x-y, +z); (+y-x, -x, +z);
(-x, -y, 1/2+z); (+y, +y-x, 1/2+z); (+x-y, +x, 1/2+z);

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Created 13 October 1999, Last Update 15 December 2011

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