# H centered cell

The **H centered cell** (**triple hexagonal cell**) is an alternative description of the hexagonal Bravais *hP* cell one obtains the *hH* cell by taking the new basis vectors by means of one of the following transformation *hH* cell with respect to the *hP* cell:

*H*_{1}: 110/-120/001 *H*_{2}: 2-10/110/001 *H*_{3}: 1-20/2-10/001

The resulting *hH* cell has

Secondary and tertiary elements in the *hP* cell are exchanged in the *hH* cell. For example , the space-group symbol *P*3*m*1 become *H*31*m* when the triple cell is used.

### See also

- Section 4.3.5.3 in the
*International Tables for Crystallography*, Volume A - Chapter 5 in the
*International Tables for Crystallography*, Volume A