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Crystal system: cubic Space group: F m -3 m (225^[1]) Pearson symbol: cF43 Wyckoff sequence: k2 b a

The composition is notoriously variable due to the presence of lattice defects, allowing it to be hydrated to various degrees as water molecules are incorporated into the structure to occupy cation vacancies. The variability of Prussian blue's composition is attributable to its low solubility, which leads to its rapid precipitation without the time to achieve full equilibrium between solid and liquid.^[3]^[4]

Notes

^ International Tables for Crystallography, Vol. A (2016 ed.). ISBN 978-0-470-68575-4.
^ F. Herren, P. Fischer, A. Ludi, and W. Haelg. Inorganic Chemistry 1980 19 (4), 956-959. DOI: 10.1021/ic50206a032
^ Herren, F.; Fischer, P.; Ludi, A.; Haelg, W. (1980). "Neutron diffraction study of Prussian Blue, Fe₄[Fe(CN)₆]₃·xH₂O. Location of water molecules and long-range magnetic order". Inorganic Chemistry. 19 (4): 956. doi:10.1021/ic50206a032.
^ Lundgren, C. A.; Murray, Royce W. (1988). "Observations on the composition of Prussian blue films and their electrochemistry". Inorganic Chemistry. 27 (5): 933. doi:10.1021/ic00278a036.

[1] International Tables for Crystallography, Vol. A (2016 ed.). ISBN 978-0-470-68575-4.

[2] F. Herren, P. Fischer, A. Ludi, and W. Haelg. Inorganic Chemistry 1980 19 (4), 956-959. DOI: 10.1021/ic50206a032

[Herren-3] Herren, F.; Fischer, P.; Ludi, A.; Haelg, W. (1980). "Neutron diffraction study of Prussian Blue, Fe₄[Fe(CN)₆]₃·xH₂O. Location of water molecules and long-range magnetic order". Inorganic Chemistry. 19 (4): 956. doi:10.1021/ic50206a032.

[Lundgren-4] Lundgren, C. A.; Murray, Royce W. (1988). "Observations on the composition of Prussian blue films and their electrochemistry". Inorganic Chemistry. 27 (5): 933. doi:10.1021/ic00278a036.

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