From Structure Topology to Chemical Composition. XXX. Refinement of the Crystal Structure and Chemical Formula of Shkatulkalite, Na₂Nb₂Na₃Ti(Si₂O₇)₂O₂(FO)(H₂O₄)(H₂2O)₃, a Lamprophyllite-Group (Seidozerite Supergroup) TS-Block Mineral from the Lovozero Massif, Kola Peninsula, Russia
Shkatulkalite, ideally Na5TiNb2(Si2O7)2O3F(H2O)7, is a lamprophyllite-group (seidozerite supergroup) TS-block mineral from the Lovozero massif, Kola Peninsula, Russia. The crystal structure of shkatulkalite was refined as triclinic, space group P-1, a 5.464(1), b 7.161(1), c 15.573(1) Å, α 90.00(3),...
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Online Access: | http://hdl.handle.net/2434/929733 https://doi.org/10.3749/canmin.2100016 |
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ftunivmilanoair:oai:air.unimi.it:2434/929733 2024-02-11T10:05:34+01:00 From Structure Topology to Chemical Composition. XXX. Refinement of the Crystal Structure and Chemical Formula of Shkatulkalite, Na₂Nb₂Na₃Ti(Si₂O₇)₂O₂(FO)(H₂O₄)(H₂2O)₃, a Lamprophyllite-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 2022-04-19 http://hdl.handle.net/2434/929733 https://doi.org/10.3749/canmin.2100016 eng eng Mineralogical Association of Canada info:eu-repo/semantics/altIdentifier/wos/WOS:000806703700007 volume:60 issue:3 firstpage:493 lastpage:512 numberofpages:20 journal:CANADIAN MINERALOGIST http://hdl.handle.net/2434/929733 doi:10.3749/canmin.2100016 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85132236495 info:eu-repo/semantics/restrictedAccess shkatulkalite Ti-silicate Lovozero alkaline massif Kola Peninsula structure refinement chemical formula lamprophyllite group seidozerite supergroup TS block Settore GEO/06 - Mineralogia info:eu-repo/semantics/article 2022 ftunivmilanoair https://doi.org/10.3749/canmin.2100016 2024-01-23T23:13:36Z Shkatulkalite, ideally Na5TiNb2(Si2O7)2O3F(H2O)7, is a lamprophyllite-group (seidozerite supergroup) TS-block mineral from the Lovozero massif, Kola Peninsula, Russia. The crystal structure of shkatulkalite was refined as triclinic, space group P-1, a 5.464(1), b 7.161(1), c 15.573(1) Å, α 90.00(3), β 95.75(3), γ 90.00(3)°, V 606.3(4) Å3, R1 = 7.26%. The previously given chemical analysis has been modified to better fit the crystal structure: Nb2O5 24.15, TiO2 11.35, SiO2 27.22, BaO 1.15, SrO 2.20, MnO 1.68, CaO 0.46, K2O 0.29, Na2O 14.78, H2O 15.27, F 1.61, O = F −0.68, sum 99.48 wt.%; H2O was determined from structure-refinement results. The empirical formula was calculated on 25.27 (O + F) apfu (in accord with the crystal structure): (Na1.40Sr0.19Ba0.07K0.05)Σ1.71(Na2.86Mn0.10Ca0.07)Σ3.03(Nb1.62Ti1.27Mn0.11)Σ3Si4.03O24.52H15.11F0.75, Z = 1. The ideal structural formula is as follows: Na2Nb2Na3Ti(Si2O7)2O2(FO)(H2O)4(H2O)3. The crystal structure of shkatulkalite [basic structure type B5(LG)] is a combination of a TS (titanium-silicate) block and an I (intermediate) block. The TS block consists of HOH sheets (H-heteropolyhedral, O-octahedral). The TS block exhibits linkage and stereochemistry typical for the lamprophyllite group where Ti (+ Nb + Fe3+ + Mg) = 3 apfu. The O sheet is composed of Ti-dominant MO(1) and Na-dominant MO(2,3) octahedra. In the H sheet in shkatulkalite, Si2O7 groups link to Nb-dominant MH octahedra. The AP site occurs in the plane of the H sheet and splits into AP(1) and AP(2) sites, occupied by Na at 70% and Sr (less Ba and K) at 11%. The I block consists of H2O groups. The I block of shkatulkalite is topologically identical to those in the derivative structures of kazanskyite and nechelyustovite. The structure of the lamprophyllite-group mineral shkatulkalite has a counterpart structure in the murmanite group (Ti = 4 apfu): kolskyite, ideally Na2CaTi4(Si2O7)2O4(H2O)7 [basic structure type B7(MG)]: the two structures have TS blocks of different topology and similar I blocks, mainly ... Article in Journal/Newspaper kola peninsula The University of Milan: Archivio Istituzionale della Ricerca (AIR) Kola Peninsula Lovozero ENVELOPE(35.016,35.016,68.006,68.006) The Canadian Mineralogist 60 3 493 512 |
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Open Polar |
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The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
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ftunivmilanoair |
language |
English |
topic |
shkatulkalite Ti-silicate Lovozero alkaline massif Kola Peninsula structure refinement chemical formula lamprophyllite group seidozerite supergroup TS block Settore GEO/06 - Mineralogia |
spellingShingle |
shkatulkalite Ti-silicate Lovozero alkaline massif Kola Peninsula structure refinement chemical formula lamprophyllite 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. XXX. Refinement of the Crystal Structure and Chemical Formula of Shkatulkalite, Na₂Nb₂Na₃Ti(Si₂O₇)₂O₂(FO)(H₂O₄)(H₂2O)₃, a Lamprophyllite-Group (Seidozerite Supergroup) TS-Block Mineral from the Lovozero Massif, Kola Peninsula, Russia |
topic_facet |
shkatulkalite Ti-silicate Lovozero alkaline massif Kola Peninsula structure refinement chemical formula lamprophyllite group seidozerite supergroup TS block Settore GEO/06 - Mineralogia |
description |
Shkatulkalite, ideally Na5TiNb2(Si2O7)2O3F(H2O)7, is a lamprophyllite-group (seidozerite supergroup) TS-block mineral from the Lovozero massif, Kola Peninsula, Russia. The crystal structure of shkatulkalite was refined as triclinic, space group P-1, a 5.464(1), b 7.161(1), c 15.573(1) Å, α 90.00(3), β 95.75(3), γ 90.00(3)°, V 606.3(4) Å3, R1 = 7.26%. The previously given chemical analysis has been modified to better fit the crystal structure: Nb2O5 24.15, TiO2 11.35, SiO2 27.22, BaO 1.15, SrO 2.20, MnO 1.68, CaO 0.46, K2O 0.29, Na2O 14.78, H2O 15.27, F 1.61, O = F −0.68, sum 99.48 wt.%; H2O was determined from structure-refinement results. The empirical formula was calculated on 25.27 (O + F) apfu (in accord with the crystal structure): (Na1.40Sr0.19Ba0.07K0.05)Σ1.71(Na2.86Mn0.10Ca0.07)Σ3.03(Nb1.62Ti1.27Mn0.11)Σ3Si4.03O24.52H15.11F0.75, Z = 1. The ideal structural formula is as follows: Na2Nb2Na3Ti(Si2O7)2O2(FO)(H2O)4(H2O)3. The crystal structure of shkatulkalite [basic structure type B5(LG)] is a combination of a TS (titanium-silicate) block and an I (intermediate) block. The TS block consists of HOH sheets (H-heteropolyhedral, O-octahedral). The TS block exhibits linkage and stereochemistry typical for the lamprophyllite group where Ti (+ Nb + Fe3+ + Mg) = 3 apfu. The O sheet is composed of Ti-dominant MO(1) and Na-dominant MO(2,3) octahedra. In the H sheet in shkatulkalite, Si2O7 groups link to Nb-dominant MH octahedra. The AP site occurs in the plane of the H sheet and splits into AP(1) and AP(2) sites, occupied by Na at 70% and Sr (less Ba and K) at 11%. The I block consists of H2O groups. The I block of shkatulkalite is topologically identical to those in the derivative structures of kazanskyite and nechelyustovite. The structure of the lamprophyllite-group mineral shkatulkalite has a counterpart structure in the murmanite group (Ti = 4 apfu): kolskyite, ideally Na2CaTi4(Si2O7)2O4(H2O)7 [basic structure type B7(MG)]: the two structures have TS blocks of different topology and similar I blocks, mainly ... |
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. XXX. Refinement of the Crystal Structure and Chemical Formula of Shkatulkalite, Na₂Nb₂Na₃Ti(Si₂O₇)₂O₂(FO)(H₂O₄)(H₂2O)₃, a Lamprophyllite-Group (Seidozerite Supergroup) TS-Block Mineral from the Lovozero Massif, Kola Peninsula, Russia |
title_short |
From Structure Topology to Chemical Composition. XXX. Refinement of the Crystal Structure and Chemical Formula of Shkatulkalite, Na₂Nb₂Na₃Ti(Si₂O₇)₂O₂(FO)(H₂O₄)(H₂2O)₃, a Lamprophyllite-Group (Seidozerite Supergroup) TS-Block Mineral from the Lovozero Massif, Kola Peninsula, Russia |
title_full |
From Structure Topology to Chemical Composition. XXX. Refinement of the Crystal Structure and Chemical Formula of Shkatulkalite, Na₂Nb₂Na₃Ti(Si₂O₇)₂O₂(FO)(H₂O₄)(H₂2O)₃, a Lamprophyllite-Group (Seidozerite Supergroup) TS-Block Mineral from the Lovozero Massif, Kola Peninsula, Russia |
title_fullStr |
From Structure Topology to Chemical Composition. XXX. Refinement of the Crystal Structure and Chemical Formula of Shkatulkalite, Na₂Nb₂Na₃Ti(Si₂O₇)₂O₂(FO)(H₂O₄)(H₂2O)₃, a Lamprophyllite-Group (Seidozerite Supergroup) TS-Block Mineral from the Lovozero Massif, Kola Peninsula, Russia |
title_full_unstemmed |
From Structure Topology to Chemical Composition. XXX. Refinement of the Crystal Structure and Chemical Formula of Shkatulkalite, Na₂Nb₂Na₃Ti(Si₂O₇)₂O₂(FO)(H₂O₄)(H₂2O)₃, a Lamprophyllite-Group (Seidozerite Supergroup) TS-Block Mineral from the Lovozero Massif, Kola Peninsula, Russia |
title_sort |
from structure topology to chemical composition. xxx. refinement of the crystal structure and chemical formula of shkatulkalite, na₂nb₂na₃ti(si₂o₇)₂o₂(fo)(h₂o₄)(h₂2o)₃, a lamprophyllite-group (seidozerite supergroup) ts-block mineral from the lovozero massif, kola peninsula, russia |
publisher |
Mineralogical Association of Canada |
publishDate |
2022 |
url |
http://hdl.handle.net/2434/929733 https://doi.org/10.3749/canmin.2100016 |
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_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000806703700007 volume:60 issue:3 firstpage:493 lastpage:512 numberofpages:20 journal:CANADIAN MINERALOGIST http://hdl.handle.net/2434/929733 doi:10.3749/canmin.2100016 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85132236495 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.3749/canmin.2100016 |
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