| Structural type | A1 |
| Common name | face-centered cubic (fcc) |
| Definition | ideal ABC close-packed structure |
| Prototype | Cu |
| Pearson symbol | cF4 |
| Space group | 225 Fm-3m Oh5 |
| Chemical formula | A |
| Bonding | metallic |
| Atomic positions | A (4a) 0 0 0 |
| Coordination | 12co |
| PDB files | A1, voids (6o at 4b labeled by O, 4t at 4c by H) |
| Related structures | alternative ideal packing is hcp |
| Substructures | A6 – tetragonal distortion, A10 – rhombohedral distortion |
| Substances | late transition and other metals (see the table below) |
| A | a | |
|---|---|---|
| Ni | 3.5243 | |
| β-Co | 3.544 | T>700K |
| Cu | 3.6148 | |
| γ-Fe | 3.64 | 1180K<T<1700K |
| Rh | 3.803 | |
| Ir | 3.8389 | |
| Pd | 3.8902 | |
| Pt | 3.9233 | |
| Al | 4.0491 | |
| Au | 4.0783 | |
| Ag | 4.0862 | |
| Pb | 4.9495 | |
| Ce | 5.1612 | |
| Yb | 5.483 | |
| Ca | 5.56 | T<716K |
| Sr | 6.085 | T<488K |