Prossima pubblicazione.
Referenza:
▪ Bosi, F., Hatert, F., Hålenius, U., Pasero, M., Miyawaki, R., Mills, S.J. (2019): On the application of the IMA-CNMNC dominant-valency rule to complex mineral compositions. Mineralogical Magazine, 83, (in press).
Abstract:
Mineral species should be identified by an end-member formula and by using the dominant-valency rule as recommended by the IMA-CNMNC. However, the dominant-end-member approach has also been used in the literature. These two approaches generally converge, but for some intermediate compositions, significant differences between the dominant-valency rule and the dominant end-member approach can be observed. As demonstrated for garnet-supergroup minerals, for example, the end-member approach is ambiguous, since end-member proportions strongly depend on the calculation sequence. For this reason, the IMA-CNMNC strongly recommends the use of the dominant-valency rule for mineral nomenclature, because it alone may lead to unambiguous mineral identification. Although the simple application of the dominant-valency rule is successful for the identification of many mineral compositions, sometimes it leads to unbalanced end-member formulae, due to the occurrence of a coupled heterovalent substitution at two sites along with a heterovalent substitution at a single site. In these cases, it may be useful to use the site-total-charge approach to identify the dominant root-charge arrangement on which to apply the dominant-constituent rule. The dominant-valency rule and the site-total-charge approach may be considered two procedures complementary to each other for mineral identification. Their critical point is to find the most appropriate root-charge and atomic arrangements consistent with the overriding condition dictated by the end-member formula. These procedures were approved by the IMA−CNMNC in May 2019.
NdR: Superbo articolo (bravo Ferdinando!) e molto apprezzabile la velocità (davvero insolita) con cui si andrà alla pubblicazione.
Si tratta di un importantissimo lavoro che permetterà (previa approvazione da parte dell'IMA CNMNC) di correggere alcuni errori e soprattutto eviterà di farne molti altri.
Se qualcuno è interessato all'intero testo non ha che da chiedermelo: m.ciriotti@tin.it.
On the application of the IMA-CNMNC dominant-valency rule to complex mineral compositions
- Marco E. Ciriotti
- Messaggi: 31675
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
On the application of the IMA-CNMNC dominant-valency rule to complex mineral compositions
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
- Marco E. Ciriotti
- Messaggi: 31675
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
Re: On the application of the IMA-CNMNC dominant-valency rule to complex mineral compositions
Pubblicazione effettuata.
Referenza:
▪ Bosi, F., Hatert, F., Hålenius, U., Pasero, M., Miyawaki, R., Mills, S.J. (2019): On the application of the IMA-CNMNC dominant-valency rule to complex mineral compositions. Mineralogical Magazine, 83, 627-632.
Referenza:
▪ Bosi, F., Hatert, F., Hålenius, U., Pasero, M., Miyawaki, R., Mills, S.J. (2019): On the application of the IMA-CNMNC dominant-valency rule to complex mineral compositions. Mineralogical Magazine, 83, 627-632.
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
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