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On the application ...
On the application of the IMA-CNMNC dominant-valency rule to complex mineral compositions
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- Bosi, Ferdinando (författare)
- Sapienza Università di Roma, Italy
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- Hatert, Frédéric (författare)
- Université de Liège, Belgium.
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- Hålenius, Ulf (författare)
- Naturhistoriska riksmuseet,Enheten för geovetenskap
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- Pasero, Marco (författare)
- Università di Pisa, Italy.
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- Miyawaki, Ritsuro (författare)
- National Museum of Nature and Science, Tsukuba, Japan
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- Mills, Stuart J. (författare)
- Museum Victoria, Melbourne, Australia.
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Sapienza Università di Roma, Italy Université de Liège, Belgium (creator_code:org_t)
- 2019-08-23
- 2019
- Engelska.
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Ingår i: Mineralogical magazine. - : Mineralogical Society. - 0026-461X .- 1471-8022. ; 83:5, s. 627-632
- Relaterad länk:
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https://www.cambridg...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Nyckelord
- The changing Earth
- Den föränderliga jorden
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- art (ämneskategori)
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