Dana Classif. : |
Dana Code | : | 55.2.2.3 |
| Dana Class | : | 55 - Sorosilicate Minerals |
| Dana Type | : | 55.2 - Sorosilicates Sorosilicate Si2O7 Groups, Generally with No Additional Anions with cations in [6] coordination |
| Dana Group | : | 55.2.2 - Keldyshite group |
| |
| Code | Mineral | Formula | H-M Symbol | Space Group |
| 55.2.2.1 | Keldyshite | Na2-xHxZrSi2O7·n(H2O) | -1 | P-1 |
| 55.2.2.2 | Khibinskite | K2ZrSi2O7 | 2/m | B2/m |
| 55.2.2.3 | Parakeldyshite | Na2ZrSi2O7 | -1 | P-1 |
| |
|
Strunz Classif. : |
Strunz Code | : | VIII/C.04-20 |
| Strunz Class | : | VIII - Silicates |
| Strunz Type | : | VIII/C - Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders |
| Strunz Group | : | VIII/C.04 - Keldyshite - Khibinskite series |
| |
| Code | Mineral | Formula | H-M Symbol | Space Group |
| VIII/C.04-10 | Keldyshite | Na2-xHxZrSi2O7·n(H2O) | -1 | P-1 |
| VIII/C.04-20 | Parakeldyshite | Na2ZrSi2O7 | -1 | P-1 |
| VIII/C.04-30 | Khibinskite | K2ZrSi2O7 | 2/m | B2/m |