| Structural type | B1 |
| Common name | rock salt |
| Definition | fcc lattice of large ions with the smaller ions occupying octahedral voids |
| Prototype | NaCl |
| Pearson symbol | cF8 |
| Space group | 225 Fm-3m Oh5 |
| Chemical formula | AX |
| Bonding | ionic |
| Atomic positions |
A (4a) 0 0 0 (marked by C) |
| Coordination | AX, XA – 6o |
| Sublattices | A, X – fcc |
| PDB files | B1 |
| Superstructures | sc for A=X |
| Substances | ionic compounds I+VII (NaCl, LiF), II+VI (CaO, MgO, BaS), and rarely III+VII (ScN) |