Комиссия IMA по новым минералам и названиям минералов: нормы и рекомендации по номенклатуре минералов, 1998 Модулированные структуры

Misfits between structural units can also be accommodated by structural perturbations. If these perturbations are of a periodic nature, the resultant structures are termed modulated structures, and are generally manifested in diffraction patterns by the appearance of superstructure reflections. Modulated variants of an existing mineral species do not warrant separate species status.

Example: In the antigorite structure, a misfit between the octahedral and tetrahedral layers is resolved by structural adjustments that result in the formation of structural waves with different periodicities. The various modulations are not regarded as separate species.


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