From structure topology to chemical composition. XVIII. Titanium silicates : revision of the crystal structure and chemical formula of betalomonosovite, a group-IV TS-block mineral from the Lovozero alkaline massif, Kola peninsula, Russia
The crystal structure of betalomonosovite, ideally Na6□4Ti4 (Si2O7)2 [PO3 (OH)][PO2 (OH) 2]O2 (OF), a 5.3331(7), b 14.172 (2), c 14.509(2) Å, α 103.174(2), β 96.320(2), γ 90.278(2)°, V 1060.7(4) Å3, from the Lovozero alkaline massif, Kola peninsula, Russia, has been refined in the space group P1 to...
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Online Access: | http://hdl.handle.net/2434/477251 https://doi.org/10.3749/canmin.1400044 |
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ftunivmilanoair:oai:air.unimi.it:2434/477251 2024-02-11T10:05:34+01:00 From structure topology to chemical composition. XVIII. Titanium silicates : revision of the crystal structure and chemical formula of betalomonosovite, a group-IV TS-block mineral from the Lovozero alkaline massif, Kola peninsula, Russia E. Sokolova Y. Abdu F. C. Hawthorne A. Genovese A. P. Khomyakov F. Cámara E. Sokolova Y. Abdu F.C. Hawthorne A. Genovese F. Cámara A.P. Khomyakov 2015-05 http://hdl.handle.net/2434/477251 https://doi.org/10.3749/canmin.1400044 eng eng Mineralogical Association of Canada info:eu-repo/semantics/altIdentifier/wos/WOS:000368661400002 volume:53 issue:3 firstpage:401 lastpage:428 numberofpages:28 journal:CANADIAN MINERALOGIST http://hdl.handle.net/2434/477251 doi:10.3749/canmin.1400044 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84950315768 info:eu-repo/semantics/closedAccess Betalomonosovite Chemical formula Crystal structure EMP analysi FTIR spectroscopy Raman spectroscopy Transmission electron microscopy TS-block Settore GEO/06 - Mineralogia info:eu-repo/semantics/article 2015 ftunivmilanoair https://doi.org/10.3749/canmin.1400044 2024-01-23T23:40:23Z The crystal structure of betalomonosovite, ideally Na6□4Ti4 (Si2O7)2 [PO3 (OH)][PO2 (OH) 2]O2 (OF), a 5.3331(7), b 14.172 (2), c 14.509(2) Å, α 103.174(2), β 96.320(2), γ 90.278(2)°, V 1060.7(4) Å3, from the Lovozero alkaline massif, Kola peninsula, Russia, has been refined in the space group P1 to R = 6.64% using 3379 observed (Fo > 4σF) reflections collected with a single-crystal APEX II ULTRA three-circle diffractometer with a rotating-anode generator (MoKα), multilayer optics, and an APEX-II 4K CCD detector. Electron-microprobe analysis gave the empirical formula (Na5.39Ca0.36Mn0.04Mg0.01)Σ5.80 (Ti2.77Nb0.48Mg0.29Fe3+0.23Mn0.20Zr0.02Ta0.01)Σ4 (Si2.06O7)2 [P1.98O5 (OH) 3]O2 [O0.82F0.65 (OH) 0.53]Σ2, Dcalc. = 2.969 g cm-3, Z = 2, calculated on the basis of 26 (O + F) apfu, with H2O determined from structure refinement. The crystal structure of betalomonosovite is characterized by extensive cation and anion disorder: more than 50% of cation sites are partly occupied. The crystal structure of betalomonosovite is a combination of a titanium silicate (TS) block and an intermediate (I) block. The TS block consists of HOH sheets (H-heteropolyhedral, O-octahedral) and exhibits linkage and stereochemistry typical for Group IV (Ti + Mg + Mn = 4 apfu) of the TS-block minerals. The I block is a framework of Na polyhedra and P tetrahedra which ideally gives Na2□ 4 [PO3 (OH)][PO2 (OH) 2] pfu. Betalomonosovite is an Na-poor OH-bearing analogue of lomonosovite, Na10Ti4 (Si2O7)2 (PO4)2O4. In the betalomonosovite structure, there is less Na in the I block and in the TS block when compared to the lomonosovite structure. The OH groups occur mainly in the I block where they coordinate P and Na atoms and in the O sheet of the TS block (minor). The presence of OH groups in the I block and in the TS block is supported by IR spectroscopy and bond-valence calculations on anions. High-resolution TEM of lomonosovite shows the presence of pervasive microstructural intergrowths, accounting for the presence of signals from H2O in the ... 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 53 3 401 428 |
institution |
Open Polar |
collection |
The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
op_collection_id |
ftunivmilanoair |
language |
English |
topic |
Betalomonosovite Chemical formula Crystal structure EMP analysi FTIR spectroscopy Raman spectroscopy Transmission electron microscopy TS-block Settore GEO/06 - Mineralogia |
spellingShingle |
Betalomonosovite Chemical formula Crystal structure EMP analysi FTIR spectroscopy Raman spectroscopy Transmission electron microscopy TS-block Settore GEO/06 - Mineralogia E. Sokolova Y. Abdu F. C. Hawthorne A. Genovese A. P. Khomyakov F. Cámara From structure topology to chemical composition. XVIII. Titanium silicates : revision of the crystal structure and chemical formula of betalomonosovite, a group-IV TS-block mineral from the Lovozero alkaline massif, Kola peninsula, Russia |
topic_facet |
Betalomonosovite Chemical formula Crystal structure EMP analysi FTIR spectroscopy Raman spectroscopy Transmission electron microscopy TS-block Settore GEO/06 - Mineralogia |
description |
The crystal structure of betalomonosovite, ideally Na6□4Ti4 (Si2O7)2 [PO3 (OH)][PO2 (OH) 2]O2 (OF), a 5.3331(7), b 14.172 (2), c 14.509(2) Å, α 103.174(2), β 96.320(2), γ 90.278(2)°, V 1060.7(4) Å3, from the Lovozero alkaline massif, Kola peninsula, Russia, has been refined in the space group P1 to R = 6.64% using 3379 observed (Fo > 4σF) reflections collected with a single-crystal APEX II ULTRA three-circle diffractometer with a rotating-anode generator (MoKα), multilayer optics, and an APEX-II 4K CCD detector. Electron-microprobe analysis gave the empirical formula (Na5.39Ca0.36Mn0.04Mg0.01)Σ5.80 (Ti2.77Nb0.48Mg0.29Fe3+0.23Mn0.20Zr0.02Ta0.01)Σ4 (Si2.06O7)2 [P1.98O5 (OH) 3]O2 [O0.82F0.65 (OH) 0.53]Σ2, Dcalc. = 2.969 g cm-3, Z = 2, calculated on the basis of 26 (O + F) apfu, with H2O determined from structure refinement. The crystal structure of betalomonosovite is characterized by extensive cation and anion disorder: more than 50% of cation sites are partly occupied. The crystal structure of betalomonosovite is a combination of a titanium silicate (TS) block and an intermediate (I) block. The TS block consists of HOH sheets (H-heteropolyhedral, O-octahedral) and exhibits linkage and stereochemistry typical for Group IV (Ti + Mg + Mn = 4 apfu) of the TS-block minerals. The I block is a framework of Na polyhedra and P tetrahedra which ideally gives Na2□ 4 [PO3 (OH)][PO2 (OH) 2] pfu. Betalomonosovite is an Na-poor OH-bearing analogue of lomonosovite, Na10Ti4 (Si2O7)2 (PO4)2O4. In the betalomonosovite structure, there is less Na in the I block and in the TS block when compared to the lomonosovite structure. The OH groups occur mainly in the I block where they coordinate P and Na atoms and in the O sheet of the TS block (minor). The presence of OH groups in the I block and in the TS block is supported by IR spectroscopy and bond-valence calculations on anions. High-resolution TEM of lomonosovite shows the presence of pervasive microstructural intergrowths, accounting for the presence of signals from H2O in the ... |
author2 |
E. Sokolova Y. Abdu F.C. Hawthorne A. Genovese F. Cámara A.P. Khomyakov |
format |
Article in Journal/Newspaper |
author |
E. Sokolova Y. Abdu F. C. Hawthorne A. Genovese A. P. Khomyakov F. Cámara |
author_facet |
E. Sokolova Y. Abdu F. C. Hawthorne A. Genovese A. P. Khomyakov F. Cámara |
author_sort |
E. Sokolova |
title |
From structure topology to chemical composition. XVIII. Titanium silicates : revision of the crystal structure and chemical formula of betalomonosovite, a group-IV TS-block mineral from the Lovozero alkaline massif, Kola peninsula, Russia |
title_short |
From structure topology to chemical composition. XVIII. Titanium silicates : revision of the crystal structure and chemical formula of betalomonosovite, a group-IV TS-block mineral from the Lovozero alkaline massif, Kola peninsula, Russia |
title_full |
From structure topology to chemical composition. XVIII. Titanium silicates : revision of the crystal structure and chemical formula of betalomonosovite, a group-IV TS-block mineral from the Lovozero alkaline massif, Kola peninsula, Russia |
title_fullStr |
From structure topology to chemical composition. XVIII. Titanium silicates : revision of the crystal structure and chemical formula of betalomonosovite, a group-IV TS-block mineral from the Lovozero alkaline massif, Kola peninsula, Russia |
title_full_unstemmed |
From structure topology to chemical composition. XVIII. Titanium silicates : revision of the crystal structure and chemical formula of betalomonosovite, a group-IV TS-block mineral from the Lovozero alkaline massif, Kola peninsula, Russia |
title_sort |
from structure topology to chemical composition. xviii. titanium silicates : revision of the crystal structure and chemical formula of betalomonosovite, a group-iv ts-block mineral from the lovozero alkaline massif, kola peninsula, russia |
publisher |
Mineralogical Association of Canada |
publishDate |
2015 |
url |
http://hdl.handle.net/2434/477251 https://doi.org/10.3749/canmin.1400044 |
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:000368661400002 volume:53 issue:3 firstpage:401 lastpage:428 numberofpages:28 journal:CANADIAN MINERALOGIST http://hdl.handle.net/2434/477251 doi:10.3749/canmin.1400044 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84950315768 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.3749/canmin.1400044 |
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