On the Isomorphism of Sodium at the M (2) Site in Eudialyte-Group Minerals: The Crystal Structure of Mn-Deficient Manganoeudialyte and the Problem of the Existence of the M (2) Na-Dominant Analogue of Eudialyte
Sodium plays an important role in the crystal structures of eudialyte-group minerals given that it can occupy different crystallographic sites. Predominantly, it distributes between the N (1–5) sites situated in the large cavities of the heteropolyhedral framework. Rarely, Na occupies split sites of...
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MDPI AG
2022
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ftdoajarticles:oai:doaj.org/article:cd03299360a348e7a6d98d355ecd9e53 2023-05-15T17:05:03+02:00 On the Isomorphism of Sodium at the M (2) Site in Eudialyte-Group Minerals: The Crystal Structure of Mn-Deficient Manganoeudialyte and the Problem of the Existence of the M (2) Na-Dominant Analogue of Eudialyte Sergey M. Aksenov Nikita V. Chukanov Igor V. Pekov Yulia V. Nelyubina Dmitry A. Varlamov Lia N. Kogarko 2022-07-01T00:00:00Z https://doi.org/10.3390/min12080949 https://doaj.org/article/cd03299360a348e7a6d98d355ecd9e53 EN eng MDPI AG https://www.mdpi.com/2075-163X/12/8/949 https://doaj.org/toc/2075-163X doi:10.3390/min12080949 2075-163X https://doaj.org/article/cd03299360a348e7a6d98d355ecd9e53 Minerals, Vol 12, Iss 949, p 949 (2022) eudialyte-group minerals blocky isomorphism solid solution alkaline rocks manganeudialyte Mineralogy QE351-399.2 article 2022 ftdoajarticles https://doi.org/10.3390/min12080949 2022-12-31T01:10:08Z Sodium plays an important role in the crystal structures of eudialyte-group minerals given that it can occupy different crystallographic sites. Predominantly, it distributes between the N (1–5) sites situated in the large cavities of the heteropolyhedral framework. Rarely, Na occupies split sites of the M (2) microregion where it can predominate over other elements (predominantly Mn, Fe 2+ , and Fe 3+ ). The crystal structure of the Mn-deficient manganoeudialyte from the Lovozero alkaline complex (Kola Peninsula, Russia) has been refined. The trigonal unit–cell parameters are: a = 14.1848(2) Å, c = 30.4726(3) Å, V = 5309.90(11) Å 3 . The sample is a rare example of a high-sodium and high-calcium representative of the eudialyte group with Fe + Mn < 2 apfu . The idealized formula is Na 14 Ca 6 [(Mn,Fe) 2 Na]Zr 3 Si 2 [Si 24 O 72 ]O(OH)·2H 2 O with bivalent components, Mn 2+ and Fe 2+ , dominating at the M (2) site. The regularities of isomorphism involving M (2) Na in EGMs and the problem of the existence of the M (2) Na-dominant analogue of eudialyte are discussed. The new data obtained in this work confirm the previous conclusion that the complete isomorphism between Ca-deficient and Ca-rich members of the eudialyte group cannot be realized in frames of a single-space group ( R 3 m , R- 3 m or R 3). Thus, the existence of the M (2) Na analogue of eudialyte remains questionable. Article in Journal/Newspaper kola peninsula Directory of Open Access Journals: DOAJ Articles Kola Peninsula Lovozero ENVELOPE(35.016,35.016,68.006,68.006) Minerals 12 8 949 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
eudialyte-group minerals blocky isomorphism solid solution alkaline rocks manganeudialyte Mineralogy QE351-399.2 |
spellingShingle |
eudialyte-group minerals blocky isomorphism solid solution alkaline rocks manganeudialyte Mineralogy QE351-399.2 Sergey M. Aksenov Nikita V. Chukanov Igor V. Pekov Yulia V. Nelyubina Dmitry A. Varlamov Lia N. Kogarko On the Isomorphism of Sodium at the M (2) Site in Eudialyte-Group Minerals: The Crystal Structure of Mn-Deficient Manganoeudialyte and the Problem of the Existence of the M (2) Na-Dominant Analogue of Eudialyte |
topic_facet |
eudialyte-group minerals blocky isomorphism solid solution alkaline rocks manganeudialyte Mineralogy QE351-399.2 |
description |
Sodium plays an important role in the crystal structures of eudialyte-group minerals given that it can occupy different crystallographic sites. Predominantly, it distributes between the N (1–5) sites situated in the large cavities of the heteropolyhedral framework. Rarely, Na occupies split sites of the M (2) microregion where it can predominate over other elements (predominantly Mn, Fe 2+ , and Fe 3+ ). The crystal structure of the Mn-deficient manganoeudialyte from the Lovozero alkaline complex (Kola Peninsula, Russia) has been refined. The trigonal unit–cell parameters are: a = 14.1848(2) Å, c = 30.4726(3) Å, V = 5309.90(11) Å 3 . The sample is a rare example of a high-sodium and high-calcium representative of the eudialyte group with Fe + Mn < 2 apfu . The idealized formula is Na 14 Ca 6 [(Mn,Fe) 2 Na]Zr 3 Si 2 [Si 24 O 72 ]O(OH)·2H 2 O with bivalent components, Mn 2+ and Fe 2+ , dominating at the M (2) site. The regularities of isomorphism involving M (2) Na in EGMs and the problem of the existence of the M (2) Na-dominant analogue of eudialyte are discussed. The new data obtained in this work confirm the previous conclusion that the complete isomorphism between Ca-deficient and Ca-rich members of the eudialyte group cannot be realized in frames of a single-space group ( R 3 m , R- 3 m or R 3). Thus, the existence of the M (2) Na analogue of eudialyte remains questionable. |
format |
Article in Journal/Newspaper |
author |
Sergey M. Aksenov Nikita V. Chukanov Igor V. Pekov Yulia V. Nelyubina Dmitry A. Varlamov Lia N. Kogarko |
author_facet |
Sergey M. Aksenov Nikita V. Chukanov Igor V. Pekov Yulia V. Nelyubina Dmitry A. Varlamov Lia N. Kogarko |
author_sort |
Sergey M. Aksenov |
title |
On the Isomorphism of Sodium at the M (2) Site in Eudialyte-Group Minerals: The Crystal Structure of Mn-Deficient Manganoeudialyte and the Problem of the Existence of the M (2) Na-Dominant Analogue of Eudialyte |
title_short |
On the Isomorphism of Sodium at the M (2) Site in Eudialyte-Group Minerals: The Crystal Structure of Mn-Deficient Manganoeudialyte and the Problem of the Existence of the M (2) Na-Dominant Analogue of Eudialyte |
title_full |
On the Isomorphism of Sodium at the M (2) Site in Eudialyte-Group Minerals: The Crystal Structure of Mn-Deficient Manganoeudialyte and the Problem of the Existence of the M (2) Na-Dominant Analogue of Eudialyte |
title_fullStr |
On the Isomorphism of Sodium at the M (2) Site in Eudialyte-Group Minerals: The Crystal Structure of Mn-Deficient Manganoeudialyte and the Problem of the Existence of the M (2) Na-Dominant Analogue of Eudialyte |
title_full_unstemmed |
On the Isomorphism of Sodium at the M (2) Site in Eudialyte-Group Minerals: The Crystal Structure of Mn-Deficient Manganoeudialyte and the Problem of the Existence of the M (2) Na-Dominant Analogue of Eudialyte |
title_sort |
on the isomorphism of sodium at the m (2) site in eudialyte-group minerals: the crystal structure of mn-deficient manganoeudialyte and the problem of the existence of the m (2) na-dominant analogue of eudialyte |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/min12080949 https://doaj.org/article/cd03299360a348e7a6d98d355ecd9e53 |
long_lat |
ENVELOPE(35.016,35.016,68.006,68.006) |
geographic |
Kola Peninsula Lovozero |
geographic_facet |
Kola Peninsula Lovozero |
genre |
kola peninsula |
genre_facet |
kola peninsula |
op_source |
Minerals, Vol 12, Iss 949, p 949 (2022) |
op_relation |
https://www.mdpi.com/2075-163X/12/8/949 https://doaj.org/toc/2075-163X doi:10.3390/min12080949 2075-163X https://doaj.org/article/cd03299360a348e7a6d98d355ecd9e53 |
op_doi |
https://doi.org/10.3390/min12080949 |
container_title |
Minerals |
container_volume |
12 |
container_issue |
8 |
container_start_page |
949 |
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1766059422980767744 |