Crystallography Open Database
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Result: there are 393 entries in the selection
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Searching space group like 'P -4 21 m'
COD ID  |
Links | Formula  |
Space group |
Cell parameters | Cell volume |
Bibliography |
|---|---|---|---|---|---|---|
| 9009412 | CIF | Be Ca2 O7 Si2 | P -4 21 m | 7.433; 7.433; 4.997 90; 90; 90 | 276.082 | Yang, Z.; Fleck, M.; Pertlik, F.; Tillmanns, E.; Tao, K. The crystal structure of natural gugiaite, Ca2BeSi2O7 Locality: skarn rocks in the Gugia alkaline complex, Liaoning Province, China Note, z coordinate of Ca is altered to reproduce reported Ca-O bond lengths Neues Jahrbuch fur Mineralogie, Monatshefte, 2001, 2001, 186-192 |
| 9009730 | CIF | Ca2 Fe0.446 Mg0.554 O7 Si2 | P -4 21 m | 7.8679; 7.8679; 5.0144 90; 90; 90 | 310.411 | Kusaka, K.; Ohmasa, M.; Hagiya, K.; Iishi, K.; Haga, N. On variety of the Ca coordination in the incommensurate structure of synthetic iron-bearing akermanite, Ca2(Mg0.55,Fe0.45)Si2O7 Note: Sample is synthetic, this is the structure obtained from a standard refinement Mineralogical Journal, 1998, 20, 47-58 |
| 9009856 | CIF | Cu3 Se2 | P -4 21 m | 6.4024; 6.4024; 4.2786 90; 90; 90 | 175.383 | Heyding, R. D.; Murray, R. M. Crystal structures of Cu1.8Se, Cu3Se2, alpha- and gamma=CuSe, CuSe2, and CuSe2II Locality: Beaverlodge Region, Saskatchewan, Canada Canadian Journal of Chemistry, 1976, 54, 841-848 |
| 9010520 | CIF | Al1.91 Ca2 Fe0.02 Mg0.05 O7 Si1.02 | P -4 21 m | 7.716; 7.716; 5.089 90; 90; 90 | 302.982 | Louisnathan, S. J. Refinement of the crystal structure of a natural gehlenite, Ca2Al(Al,Si)2O7 The Canadian Mineralogist, 1971, 10, 822-837 |
| 9013636 | CIF | Ca2 Mg O7 Si2 | P -4 21 m | 7.74; 7.74; 4.932 90; 90; 90 | 295.464 | Merlini, M.; Gemmi, M.; Hanfland, M.; Crichton, W. High-pressure behavior of akermanite and gehlenite and phase stability of the normal structures in melelites Note: P = 5 GPa American Mineralogist, 2009, 94, 704-709 |
| 9013637 | CIF | Ca2 Mg O7 Si2 | P -4 21 m | 7.57; 7.57; 4.781 90; 90; 90 | 273.975 | Merlini, M.; Gemmi, M.; Hanfland, M.; Crichton, W. High-pressure behavior of akermanite and gehlenite and phase stability of the normal structures in melelites Note: P = 15 GPa American Mineralogist, 2009, 94, 704-709 |
| 9014399 | CIF | Ba2 Cu O7 Si2 | P -4 21 m | 8.284; 8.284; 5.313 90; 90; 90 | 364.603 | Du, J. M.; Zeng, H. Y.; Song, L. J.; Dong, Z. C.; Ma, H. W.; Guo, G. C.; Huang, J. S. Synthesis and structure of a new polymorph Ba2CuSi2O7 Note: known as beta-Ba2CuSi2O7 Jiegou Huaxue, 2003, 22, 33-36 |
| 9014854 | CIF | Al0.66 Ca1.96 Fe0.12 Mg0.24 Na0.04 O7 Si1.3 | P -4 21 m | 7.738; 7.738; 5.045 90; 90; 90 | 302.078 | Mokeeva, V.; Makarov, E. Isomorph in melilites: refining of crystal structure of akermanite and intermediate melilite Geokhimiya, 1979, 10, 1541-1544 |
| 9015368 | CIF | Al0.41 Ca1.5 Fe0.16 Mg0.39 Na0.5 O7 Si2 | P -4 21 m | 7.76; 7.76; 5.029 90; 90; 90 | 302.834 | Mokeeva, V.; Makarov, E. Isomorph in melilites: refining of crystal structure of akermanite and intermediate melilite Geokhimiya, 1979, 10, 1541-1544 |
| 9017316 | CIF | C H4 N2 O | P -4 21 m | 5.584; 5.584; 4.689 90; 90; 90 | 146.208 | Swaminathan, S.; Craven, B. M. The crystal structure and molecular thermal motion of urea at 12, 60 and 123 K from neutron diffraction Note: neutron data, T = 123 K Acta Crystallographica, Section B, 1984, 40, 300-306 |
| 9017317 | CIF | C H4 N2 O | P -4 21 m | 5.57; 5.57; 4.688 90; 90; 90 | 145.445 | Swaminathan, S.; Craven, B. M. The crystal structure and molecular thermal motion of urea at 12, 60 and 123 K from neutron diffraction Note: neutron data, T = 60 K Acta Crystallographica, Section B, 1984, 40, 300-306 |
| 9017318 | CIF | C H4 N2 O | P -4 21 m | 5.565; 5.565; 4.684 90; 90; 90 | 145.06 | Swaminathan, S.; Craven, B. M. The crystal structure and molecular thermal motion of urea at 12, 60 and 123 K from neutron diffraction Note: neutron data, T = 12 K Acta Crystallographica, Section B, 1984, 40, 300-306 |
| 9017542 | CIF | Al0.5 Ca1.52 Fe0.3 Mg0.2 Na0.48 O7 Si2 | P -4 21 m | 7.7661; 7.7661; 5.0297 90; 90; 90 | 303.353 | Wiedenmann, D.; Zaitsev, A. N.; Britvin, S. N.; Krivovichev, S. V.; Keller, J. Alumoakermanite, (Ca,Na)2(Al,Mg,Fe2+)(Si2O7), a new mineral from the active carbonatite-nephelinite-phonolite volcano Oldoinyo Lengai, northern Tanzania Mineralogical Magazine, 2009, 73, 373-384 |
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