| Structural type | C1 |
| Common name | fluorite, antifluorite |
| Definition | fcc lattice of cations with anions occupying tetrahedral voids |
| Prototype | CaF2 |
| Pearson symbol | cF12 |
| Space group | 225 Fm-3m Oh5 |
| Chemical formula | AX2 |
| Bonding | ionic |
| Atomic positions | A (4a) 0 0 0 (marked by C) |
| Coordination | AX – 8cb, XA – 4t |
| Sublattices | A – fcc |
| PDB files | C1 |
| Substances | fluorides and chlorides of II metals (CaF2,CdF2), some dioxides (CO2, ZrO2), hemioxides of alkali metals (Li2O) |