Table 3. The 13 known frameworks of the topological family of tridymite and its variants.
The acronym is underlined if it is realized in the composition of KAlSiO4. See the main text for explanation of all the parameters. Tri = SiO2 (tridymite-hT; Gibbs, 1926 ▸), BCT = Ca[AlSiO4]2 [Takéuchi et al. (1973 ▸); the natural occurrence as mineral svyatoslavite was later reported by Krivovichev et al. (2012 ▸)], ABW = (N2H5)LiSO4 (Brown, 1964 ▸), CaG = CaGa2O4 (Deiseroth & Müller-Buschbaum, 1973 ▸), BaF = BaFe2O4 (Mitsuda et al., 1971 ▸), par = Ba[AlSiO4]2 (paracelsian; Smith, 1953 ▸), WZP = (H3O)ZnPO4 (Sandomirskii et al., 1977 ▸), ber = NaBePO4 (beryllonite; Golovastikov, 1962 ▸), mal = NaBSiO4 (malinkoite; Sokolova et al., 2001 ▸), ANZP = (NH4)Na3[ZnPO4]4 (Harrison, 2000 ▸), NZP = (Na,K)ZnPO4 (Yakubovich & Melnikov, 1989 ▸), O1 = KAlSiO4 O1 (Gregorkiewitz, 1980 ▸) and Kp = kaliophilite (this work).
| Acronym | Space group | Unit cell | t uc | FTO | Ring topologies |
|---|---|---|---|---|---|
| Tri | P63/mmc | A, C | 4 | 6 | (1-3-5) |
| BCT | I4/mmm | B, A | 8 | 4 | (1-4) |
| ABW | Imam | A, B, C | 8 | 2 | (1-2-3) |
| CaG | Bbcm | 2A, B, C | 16 | 1 | (1-2-4) |
| BaF | Amam | A, 2B, C | 16 | 1 | (1) |
| Par | Bbmm | 2A, B, C | 16 | 1 | (1-2) |
| WZP | P63/mmc | 2A, C | 16 | 3/2 | (1-2-3), (1-3-5) |
| Ber | Imam | 3A, B, C | 24 | 2/3 | (1-2-4), (1-3-5) |
| Mal | P63/mmc | 3A, C | 36 | 2/3 | (1-2-4), (1-3-5) |
| ANZP | Bbmm | 2A, 2B, C | 32 | 1/2 | (1-2), (1-2-3) |
| NZP | P63/mcm | 2B, C | 48 | 1/2 | (1-2-4), (1-3-5) |
| O1 | Pnam | 3A, B, C | 24 | 1/3 | (1-2-3), (1-2-4) |
| Kp | P-6c2 | 3B, C | 108 | 1/9 | (1-2-3), (1-2-4), (1-3-5) |