| coo | Elemental | coo-B | Binary | bonding | |||
|---|---|---|---|---|---|---|---|
| structure | crystal | formula | structure | crystal | |||
| 1l | A14 | I2 | molecular crystal | ||||
| 2n | A8 | Se | polymeric crystal | ||||
| 3l | A9 | graphite-C | covalent, semimetal | ||||
| 3n | A7 | α-As | 3n | AB | α-GeTe | covalent-ionic, semimetal | |
| A17 | black-P | 3n | AB | GeSe | covalent-ionic | ||
| 2n | A2B3 | As2Se3 | covalent-ionic | ||||
| 4t | A4 | diamond-C | 4t | AB | B3 | covalent-ionic | |
| hP4 | hexdia-C | 4t | AB | B4 | covalent-ionic | ||
| 2n | AB2 | SiO2 | covalent-ionic | ||||
| 6o | Ah | α-Po | 6o | AB | β-GeTe | semimetal | |
| 4t | AB2 | C2 | FeS2 | covalent-ionic | |||