# Integral reflection conditions

The integral reflections are the general reflection conditions due to the centering of cells. They are given in the table below:

Reflection condition | Centering type of cell | Centering symbol |
---|---|---|

None | Primitive | PR (rhombohedral axes) |

h + k = 2n | C-face centered | C |

k + l = 2n | A-face centered | A |

l + h = 2n | B-face centered | B |

h + k + l = 2n | body centered | I |

even (‘unmixed’) | all-face centered | F |

− h + k + l = 3n | rhombohedrally centered, reverse setting | R (hexagonal axes) |

h − k + l = 3n | rhombohedrally centered, obverse setting (standard) | |

h − k = 3n | hexagonally centered | H |

### See also

Section 2.2.13.1 of International Tables of Crystallography, Volume A