Crystallography Open Database

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Searching space group like 'P -4 21 m'

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9009412 CIFBe Ca2 O7 Si2P -4 21 m7.433; 7.433; 4.997
90; 90; 90		276.082Yang, 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 CIFCa2 Fe0.446 Mg0.554 O7 Si2P -4 21 m7.8679; 7.8679; 5.0144
90; 90; 90		310.411Kusaka, 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 CIFCu3 Se2P -4 21 m6.4024; 6.4024; 4.2786
90; 90; 90		175.383Heyding, 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 CIFAl1.91 Ca2 Fe0.02 Mg0.05 O7 Si1.02P -4 21 m7.716; 7.716; 5.089
90; 90; 90		302.982Louisnathan, S. J.
Refinement of the crystal structure of a natural gehlenite, Ca2Al(Al,Si)2O7
The Canadian Mineralogist, 1971, 10, 822-837
9013636 CIFCa2 Mg O7 Si2P -4 21 m7.74; 7.74; 4.932
90; 90; 90		295.464Merlini, 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

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