Joseph A. Mandarino

Recommended nomenclature for zeolite minerals: report of the subcommittee on zeolites of the International Mineralogical Association, Commission on New Minerals and Mineral Names

Abstract This report embodies recommendations on zeolite nomenclature approved by the International Mineralogical Association Commission on New Minerals and Mineral Names. In a working definition of a zeolite mineral used for this review, interrupted tetrahedral framework structures are accepted where other zeolitic properties prevail, and complete substitution by elements other than Si and Al is allowed. Separate species are recognized in topologically distinctive compositional series in which different extra-framework cations are the most abundant in atomic proportions. To name these, the appropriate chemical symbol is attached by a hyphen to the series name as a suffix except for the names harmotome, pollucite and wairakite in the phillipsite and analcime series. Differences in space- group symmetry and in order-disorder relationships in zeolites having the same topologically distinctive framework do not in general provide adequate grounds for recognition of separate species. Zeolite species are not to be distinguished solely on Si : Al ratio except for heulandite (Si : Al < 4.0) and clinoptilolite (Si : Al ≥ 4.0). Dehydration, partial hydration, and over-hydration are not sufficient grounds for the recognition of separate species of zeolites. Use of the term ‘ideal formula’ should be avoided in referring to a simplified or averaged formula of a zeolite. Newly recognized species in compositional series are as follows: brewsterite-Sr, -Ba; chabazite-Ca, - Na, -K; clinoptilolite-K, -Na, -Ca; dachiardite-Ca, -Na; erionite-Na, -K, -Ca; faujasite-Na, -Ca, -Mg; ferrierite-Mg, -K5 -Na; gmelinite-Na, -Ca, -K; heulandite-Ca, -Na, -K5 -Sr; levyne-Ca, -Na; paulingite- K, -Ca; phillipsite-Na, -Ca, -K; stilbite-Ca, -Na. Key references, type locality, origin of name, chemical data, IZA structure-type symbols, space-group symmetry, unit-cell dimensions, and comments on structure are listed for 13 compositional series, 82 accepted zeolite mineral species, and three of doubtful status. Herschelite, leonhardite, svetlozarite, and wellsite are discredited as mineral species names. Obsolete and discredited names are listed.

Five New Minerals from Moctezuma, Sonora, Mexico

Five new minerals have been found in a tellurium deposit near the town of Moctezuma, Sonora, Mexico. Preliminary study shows that they are a leadoxy-fluoride, a zinc tellurite or tellurate, a manganese-zinc tellurite or tellurate, a manganese tellurite or tellurate, and an iron tellurite or tellurate.

Procedimentos envolvendo a Comissão de Novos Minerais da IMA, e diretrizes sobre nomenclatura mineral

Um autor que desejar introduzir um novo nome de mineral naUteratura, ou redefinir, desacreditar ou rebatizar um mineral existente, devera obter aprovacao previa da comissao de Novos Minerais e Nomes de Minerais da IMA. Este artigo esquematiza os procedimentos a serem seguidos na preparacao e . submissao de uma propostas para aprovacao, e descreve como tais propostas slo tratadas pela Comissao. Este artigo tambem inclui decisoes sobre nomenclatura tomadas pela Comissao, e apresenta diretrizes gerais sobre nomenclatura mineral. Listas de nomes de minerais desacreditados pela Comissao e de nomes de minerais de terras raras recentemente aprovados sao anexadas.