From Structure Topology to Chemical Composition. XXXI. Refinement of the Crystal Structure and Chemical Formula of Selivanovaite, NaFe3+Ti4(Si2O7)2O4(H2O)4, a Murmanite-Group (Seidozerite Supergroup) TS-Block Mineral from the Lovozero Massif, Kola Peninsula, Russia
Selivanovaite, ideally NaFe3+Ti4(Si2O7)2O4(H2O)4, is a murmanite-group (seidozerite supergroup) TS-block mineral from the Lovozero massif, Kola Peninsula, Russia. The crystal structure of selivanovaite was refined in space group C-1, a 10.524(6), b 13.815(6), c 12.213(14) Å, α 99.74(6), β 107.45(8)...
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Online Access: | https://hdl.handle.net/2434/929766 https://doi.org/10.3749/canmin.2100049 |
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ftunivmilanoair:oai:air.unimi.it:2434/929766 2024-04-21T08:06:35+00:00 From Structure Topology to Chemical Composition. XXXI. Refinement of the Crystal Structure and Chemical Formula of Selivanovaite, NaFe3+Ti4(Si2O7)2O4(H2O)4, a Murmanite-Group (Seidozerite Supergroup) TS-Block Mineral from the Lovozero Massif, Kola Peninsula, Russia Sokolova, Elena Day, Maxwell C. Hawthorne, Frank C. Cámara, Fernando E. Sokolova M.C. Day F.C. Hawthorne F. Cámara 2022-05-27 https://hdl.handle.net/2434/929766 https://doi.org/10.3749/canmin.2100049 eng eng Mineralogical Association of Canada info:eu-repo/semantics/altIdentifier/wos/WOS:000806703700008 volume:60 issue:3 firstpage:513 lastpage:531 numberofpages:19 journal:CANADIAN MINERALOGIST https://hdl.handle.net/2434/929766 doi:10.3749/canmin.2100049 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85132241010 info:eu-repo/semantics/closedAccess selivanovaite Ti-silicate Lovozero alkaline massif Kola Peninsula structure refinement chemical formula murmanite group seidozerite supergroup TS block Settore GEO/06 - Mineralogia info:eu-repo/semantics/article 2022 ftunivmilanoair https://doi.org/10.3749/canmin.2100049 2024-03-27T16:16:16Z Selivanovaite, ideally NaFe3+Ti4(Si2O7)2O4(H2O)4, is a murmanite-group (seidozerite supergroup) TS-block mineral from the Lovozero massif, Kola Peninsula, Russia. The crystal structure of selivanovaite was refined in space group C-1, a 10.524(6), b 13.815(6), c 12.213(14) Å, α 99.74(6), β 107.45(8), γ 90.15(10)°, V 1666.8(26) Å3, R1 = 21.40%. The previously given chemical analysis has been modified to better fit the crystal structure: Nb2O5 8.51, ZrO2 2.94, TiO2 31.96, SiO2 30.62, Al2O3 0.05, Fe2O3 5.08, FeO 3.23, MnO 3.36, CaO 2.14, MgO 0.75, Na2O 2.47, H2O 8.88, sum 99.99 wt.%; H2O was determined from structure-refinement results: H2O = 3.34 pfu, OH = 1.05 pfu. The empirical formula calculated on 22 O apfu is: (Na0.63Ca0.30Mn0.36)Σ1.29(Fe3+0.50Fe2+0.35)Σ0.85(Ti3.14Nb0.50Zr0.19Mg0.15Mn0.01Al0.01)Σ4.00Si3.99O22.00H7.73, Z = 4. The crystal structure of selivanovaite [basic structure type B1(MG)] is an array of TS blocks (Titanium Silicate) connected via hydrogen bonds. The TS block consists of HOH sheets (H = heteropolyhedral, O = octahedral) parallel to (001). In the O sheet, the Ti-dominant MO(1,2) sites, Na-dominant MO(3) site, and □-dominant MO(4) sites give ideally Na□Ti2pfu. In the H sheet, the Ti-dominant MH(1,2) sites, Fe3+-dominant AP(1) site, and vacant AP(2) sites give ideally Fe3+□Ti2pfu. The MH and AP(1) polyhedra and Si2O7 groups constitute the H sheet. The ideal structural formula of selivanovaite of the form AP2MH2MO4(Si2O7)2(XOM,A)4(XPM,A)4 is Fe3+□Ti2Na□Ti2(Si2O7)2O4(H2O)4. Selivanovaite is a Fe3+-bearing and OH-poor analogue of vigrishinite, ideally Zn□Ti2Na□Ti2(Si2O7)2O2O(OH)(H2O)4. Vigrishinite and selivanovaite are related by the following substitution: O(OH)–vig + H(Zn2+)vig ↔ O(O2–)sel + H(Fe3+)sel. Selivanovaite is a Fe3+-bearing and Na-poor analogue of murmanite, ideally Na2Ti2Na2Ti2(Si2O7)2O4(H2O)4. Murmanite and selivanovaite are related by the following substitution: O(Na+)mur + H(Na+2)mur ↔ O(□)sel + H(Fe3+)sel + H(□)sel. The doubling of the t1 and t2 translations of selivanovaite ... Article in Journal/Newspaper kola peninsula The University of Milan: Archivio Istituzionale della Ricerca (AIR) The Canadian Mineralogist 60 3 513 531 |
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The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
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ftunivmilanoair |
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English |
topic |
selivanovaite Ti-silicate Lovozero alkaline massif Kola Peninsula structure refinement chemical formula murmanite group seidozerite supergroup TS block Settore GEO/06 - Mineralogia |
spellingShingle |
selivanovaite Ti-silicate Lovozero alkaline massif Kola Peninsula structure refinement chemical formula murmanite group seidozerite supergroup TS block Settore GEO/06 - Mineralogia Sokolova, Elena Day, Maxwell C. Hawthorne, Frank C. Cámara, Fernando From Structure Topology to Chemical Composition. XXXI. Refinement of the Crystal Structure and Chemical Formula of Selivanovaite, NaFe3+Ti4(Si2O7)2O4(H2O)4, a Murmanite-Group (Seidozerite Supergroup) TS-Block Mineral from the Lovozero Massif, Kola Peninsula, Russia |
topic_facet |
selivanovaite Ti-silicate Lovozero alkaline massif Kola Peninsula structure refinement chemical formula murmanite group seidozerite supergroup TS block Settore GEO/06 - Mineralogia |
description |
Selivanovaite, ideally NaFe3+Ti4(Si2O7)2O4(H2O)4, is a murmanite-group (seidozerite supergroup) TS-block mineral from the Lovozero massif, Kola Peninsula, Russia. The crystal structure of selivanovaite was refined in space group C-1, a 10.524(6), b 13.815(6), c 12.213(14) Å, α 99.74(6), β 107.45(8), γ 90.15(10)°, V 1666.8(26) Å3, R1 = 21.40%. The previously given chemical analysis has been modified to better fit the crystal structure: Nb2O5 8.51, ZrO2 2.94, TiO2 31.96, SiO2 30.62, Al2O3 0.05, Fe2O3 5.08, FeO 3.23, MnO 3.36, CaO 2.14, MgO 0.75, Na2O 2.47, H2O 8.88, sum 99.99 wt.%; H2O was determined from structure-refinement results: H2O = 3.34 pfu, OH = 1.05 pfu. The empirical formula calculated on 22 O apfu is: (Na0.63Ca0.30Mn0.36)Σ1.29(Fe3+0.50Fe2+0.35)Σ0.85(Ti3.14Nb0.50Zr0.19Mg0.15Mn0.01Al0.01)Σ4.00Si3.99O22.00H7.73, Z = 4. The crystal structure of selivanovaite [basic structure type B1(MG)] is an array of TS blocks (Titanium Silicate) connected via hydrogen bonds. The TS block consists of HOH sheets (H = heteropolyhedral, O = octahedral) parallel to (001). In the O sheet, the Ti-dominant MO(1,2) sites, Na-dominant MO(3) site, and □-dominant MO(4) sites give ideally Na□Ti2pfu. In the H sheet, the Ti-dominant MH(1,2) sites, Fe3+-dominant AP(1) site, and vacant AP(2) sites give ideally Fe3+□Ti2pfu. The MH and AP(1) polyhedra and Si2O7 groups constitute the H sheet. The ideal structural formula of selivanovaite of the form AP2MH2MO4(Si2O7)2(XOM,A)4(XPM,A)4 is Fe3+□Ti2Na□Ti2(Si2O7)2O4(H2O)4. Selivanovaite is a Fe3+-bearing and OH-poor analogue of vigrishinite, ideally Zn□Ti2Na□Ti2(Si2O7)2O2O(OH)(H2O)4. Vigrishinite and selivanovaite are related by the following substitution: O(OH)–vig + H(Zn2+)vig ↔ O(O2–)sel + H(Fe3+)sel. Selivanovaite is a Fe3+-bearing and Na-poor analogue of murmanite, ideally Na2Ti2Na2Ti2(Si2O7)2O4(H2O)4. Murmanite and selivanovaite are related by the following substitution: O(Na+)mur + H(Na+2)mur ↔ O(□)sel + H(Fe3+)sel + H(□)sel. The doubling of the t1 and t2 translations of selivanovaite ... |
author2 |
E. Sokolova M.C. Day F.C. Hawthorne F. Cámara |
format |
Article in Journal/Newspaper |
author |
Sokolova, Elena Day, Maxwell C. Hawthorne, Frank C. Cámara, Fernando |
author_facet |
Sokolova, Elena Day, Maxwell C. Hawthorne, Frank C. Cámara, Fernando |
author_sort |
Sokolova, Elena |
title |
From Structure Topology to Chemical Composition. XXXI. Refinement of the Crystal Structure and Chemical Formula of Selivanovaite, NaFe3+Ti4(Si2O7)2O4(H2O)4, a Murmanite-Group (Seidozerite Supergroup) TS-Block Mineral from the Lovozero Massif, Kola Peninsula, Russia |
title_short |
From Structure Topology to Chemical Composition. XXXI. Refinement of the Crystal Structure and Chemical Formula of Selivanovaite, NaFe3+Ti4(Si2O7)2O4(H2O)4, a Murmanite-Group (Seidozerite Supergroup) TS-Block Mineral from the Lovozero Massif, Kola Peninsula, Russia |
title_full |
From Structure Topology to Chemical Composition. XXXI. Refinement of the Crystal Structure and Chemical Formula of Selivanovaite, NaFe3+Ti4(Si2O7)2O4(H2O)4, a Murmanite-Group (Seidozerite Supergroup) TS-Block Mineral from the Lovozero Massif, Kola Peninsula, Russia |
title_fullStr |
From Structure Topology to Chemical Composition. XXXI. Refinement of the Crystal Structure and Chemical Formula of Selivanovaite, NaFe3+Ti4(Si2O7)2O4(H2O)4, a Murmanite-Group (Seidozerite Supergroup) TS-Block Mineral from the Lovozero Massif, Kola Peninsula, Russia |
title_full_unstemmed |
From Structure Topology to Chemical Composition. XXXI. Refinement of the Crystal Structure and Chemical Formula of Selivanovaite, NaFe3+Ti4(Si2O7)2O4(H2O)4, a Murmanite-Group (Seidozerite Supergroup) TS-Block Mineral from the Lovozero Massif, Kola Peninsula, Russia |
title_sort |
from structure topology to chemical composition. xxxi. refinement of the crystal structure and chemical formula of selivanovaite, nafe3+ti4(si2o7)2o4(h2o)4, a murmanite-group (seidozerite supergroup) ts-block mineral from the lovozero massif, kola peninsula, russia |
publisher |
Mineralogical Association of Canada |
publishDate |
2022 |
url |
https://hdl.handle.net/2434/929766 https://doi.org/10.3749/canmin.2100049 |
genre |
kola peninsula |
genre_facet |
kola peninsula |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000806703700008 volume:60 issue:3 firstpage:513 lastpage:531 numberofpages:19 journal:CANADIAN MINERALOGIST https://hdl.handle.net/2434/929766 doi:10.3749/canmin.2100049 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85132241010 |
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info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.3749/canmin.2100049 |
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