| Mineral | Symmetry Class | Space Group | a | b | c | alpha | beta | gamma |
|---|---|---|---|---|---|---|---|---|
| Dumortierite | orthorhombic | P mcn | 11.7980 | 20.2100 | 4.7100 | 90.00 | 90.00 | 90.00 |
| Holtite | orthorhombic | P nma | 4.6914 | 11.8960 | 20.3830 | 90.00 | 90.00 | 90.00 |
| Holtite II | ||||||||
| Magnesiodumortierite | orthorhombic | P mcn | 11.9100 | 20.4000 | 4.7300 | 90.00 | 90.00 | 90.00 |