| Unit Cell Type | Allowed Reflections | Forbidden Reflections |
|---|---|---|
| Primitive | Any H,K,L | None |
| Body-centered | H+K+L = 2n (even) | H+K+L = 2n+1 (odd) |
| Face-centered | H,K,L all odd or all even | H,K,L mixed odd, even |
| FCC Diamond | H,K,L all odd H,K,L all even and H+K+L = 4n | H,K,L mixed odd, even H,K,L all even and H+K+L 
4n |
| Hexagonal (HCP) | L even H+2K 3n | L odd and H+2K = 3n |