Прогресс в знаниях, например, в результате уточнения структуры или новых химических знаний
Классификация и систематика минералов,
горных пород, окаменелостей, метеоритов
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Комиссия IMA по новым минералам и названиям минералов: нормы и рекомендации по номенклатуре минералов, 1998 Переопределение


Advances in knowledge such as those resulting from structure refinements or new chemical knowledge extending known ranges of solid solution do not, in general, need to be referred to the CNMMN. However, approval of the CNMMN is required if it is proposed to redefine a mineral a) on structural grounds, b) by adding or deleting one or more chemical components regarded as essential to the definition, or c) by proposing compositional limits in a solid-solution series that are not compatible with the existing definition of the 50% rule (or its equivalent in multicomponent systems). In case of doubt, the authors are invited to consult with the vice-chairman of the CNMMN.

If a mineral is shown to be a mixture and one of the components is otherwise new, the name should usually be transferred to the new phase.

Redefinition of a mineral species requires a review of the literature on the mineral to be redefined, a re-examination of the type specimen (see below), a comparison of the new data with the original, and justification for the redefinition.


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