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On the application of the IMA-CNMNC dominant-valency rule to complex mineral compositions
Sapienza Università di Roma, Italy.
Université de Liège, Belgium..
Swedish Museum of Natural History, Department of Geology.
Università di Pisa, Italy..
Show others and affiliations
2019 (English)In: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 83, no 5, p. 627-632Article in journal (Refereed) Published
Abstract [en]

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, as 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-totalcharge 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.

Place, publisher, year, edition, pages
2019. Vol. 83, no 5, p. 627-632
National Category
Geochemistry
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-3362DOI: 10.1180/mgm.2019.55OAI: oai:DiVA.org:nrm-3362DiVA, id: diva2:1367094
Available from: 2019-10-31 Created: 2019-10-31 Last updated: 2019-11-01Bibliographically approved

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