ima_cnmmn_mineral_nomenclature_1998_type specimens
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 Типовые образцы

Type specimens

Wherever possible, the redefinition, discreditation or revalidation of a mineral should be based on a study of type material. If a type specimen exists and if the original description, though faulty, represents a reasonable approximation to material on the specimen, the mineral is to be defined by reference to the type material rather than to the original description. This means that errors in the original description cannot be held to discredit a mineral unless the original description was so grossly inaccurate that, in the words of J.D. Dana (1868), “a recognition of the mineral by means of it is impossible”.

If type material cannot be obtained for study, the investigator may propose a neotype to the CNMMN, clearly stating the efforts made to seek the original type-specimen, and providing satisfactory evidence for the identity of the neotype with the original. Both the acceptance of the neotype and approval of the proposal are within the authority of the CNMMN.

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