Isomorphous crystals in the IUCr Online Dictionary of Crystallography (source code)

= Isomorphous crystals in the IUCr Online Dictionary of Crystallography
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https://dictionary.iucr.org/Isomorphous_crystals

Definition: matching space group and unit-cell dimensions, with corresponding atom types/positions except permitted atomic replacement or addition. The definition distinguishes this crystallographic relation from equality of composition alone.