| NN | Card | Specie | Formula | Space Group |
|---|---|---|---|---|
| 1. | 4734 | [1], t-thortveitite | (Sc,Y)2Si2O7 | C 2/m |
| 2. | 4735 | [2], t-thortveitite | (Sc,Y)2Si2O7 | C 2/m |
| 3. | 4736 | [3], t-thortveitite | (Sc,Y)2Si2O7 | C 2/m |
| 4. | 4737 | [4], t-thortveitite | (Sc,Y)2Si2O7 | C 2/m |
| 5. | 4738 | [5], syn, t-thortveitite | Sc2Si2O7 | C 2/m |