From structure topology to chemical composition. X. Titanium silicates: the crystal structure and crystal chemistry of nechelyustovite, a group III Ti-disilicate mineral
The crystal structure of nechelyustovite, ideally Na(4)Ba(2)Mn(1.5)square(2.5)Ti(5)Nb(Si(2)O(7))(4)O(4)(OH)(3)F(H(2)O)(6), a 5.447(1) angstrom, b 7.157(1) angstrom, c 47.259(9) angstrom, alpha 95.759(4)degrees, beta 92.136(4)degrees, gamma 89.978(4)degrees, V 1831.7(4) angstrom(3), space group P (1)...
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ftunivtorino:oai:iris.unito.it:2318/79622 2023-10-29T02:37:42+01:00 From structure topology to chemical composition. X. Titanium silicates: the crystal structure and crystal chemistry of nechelyustovite, a group III Ti-disilicate mineral CAMARA ARTIGAS, Fernando Sokolova E. Cámara F Sokolova E 2009 http://hdl.handle.net/2318/79622 https://doi.org/10.1180/minmag.2009.073.5.753 http://www.ingentaconnect.com/content/minsoc/mag/2009/00000073/00000005/art00004?crawler=true eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000272804200004 volume:73 firstpage:753 lastpage:775 numberofpages:23 journal:MINERALOGICAL MAGAZINE http://hdl.handle.net/2318/79622 doi:10.1180/minmag.2009.073.5.753 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-71449094973 http://www.ingentaconnect.com/content/minsoc/mag/2009/00000073/00000005/art00004?crawler=true info:eu-repo/semantics/openAccess nechelyustovite Ti-disilicate mineral crystal structure EMP analysi chemical formula Group III TS block info:eu-repo/semantics/article 2009 ftunivtorino https://doi.org/10.1180/minmag.2009.073.5.753 2023-10-03T22:27:39Z The crystal structure of nechelyustovite, ideally Na(4)Ba(2)Mn(1.5)square(2.5)Ti(5)Nb(Si(2)O(7))(4)O(4)(OH)(3)F(H(2)O)(6), a 5.447(1) angstrom, b 7.157(1) angstrom, c 47.259(9) angstrom, alpha 95.759(4)degrees, beta 92.136(4)degrees, gamma 89.978(4)degrees, V 1831.7(4) angstrom(3), space group P (1) over bar, Z = 2, D(calc). 3.041 g cm(-3), from Lovozero alkaline massif, Kola Peninsula, Russia, has been solved and refined to R(1) = 13.9% on the basis of 1745 unique reflections (F(o) > 15 sigma F). Electron microprobe analysis yielded the empirical formula (Na(4.21)Mn(1.11)(2+)Ca(0.46)square(1.22))(Sigma 7.00) (Ba(1.28)Sr(0.50)K(0.30)square(0.92))(Sigma 3.00)(Ti(4.14)Nb(1.43)Mn(0.33)(2+)Fe(0.06)(3+)Al(0.04))(Sigma 6.00)(Si(8.03)O(28))O(3.99)[(OH)(2.94)F(1.06)](Sigma 4.00) (H(2)O)(6.01), Z = 2, calculated on the basis of 42 (O + F) a.p.f.u, H(2)O and OH are calculated from structure refinement (H(2)O = 6 p.f.u.; F + OH = 4 p.f.u.). The crystal structure of nechelyustovite 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 Group III (Ti = 3 a. p.f.u.) of Ti-disilicate minerals: two H sheets connect to the O sheet such that two (Si(2)O(7)) groups link to the trans edges of a Ti octahedron of the O sheet. There are two distinct TS blocks of the same topology, TS(1) and TS(2), that differ in the cations of the O sheet, [(Na(1.5)Mn(1)square(0.5))Ti] and [(Na(2)Mn(0.5)square(0.5))Ti] (4 a.p.f.u.) respectively. The TS(1) and TS(2) blocks have two different H sheets, H(1,2) and H(3,4), where (Si(2)O(7)) groups link to [5]- and [6]-coordinated (Ti, Nb) polyhedra respectively. There are three peripheral sites, A(P)(1-3), occupied mainly by Ba (less Sr and K) at 96, 86 and 26% and one peripheral site A(P)(4) occupied by Na at 50%. There are two I blocks: the I(1) block is a layer of Ba atoms; the I(2) block consists of H2O groups and A(P)(3) atoms. TS blocks ... Article in Journal/Newspaper kola peninsula Università degli studi di Torino: AperTo (Archivio Istituzionale ad Accesso Aperto) Mineralogical Magazine 73 5 753 775 |
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Università degli studi di Torino: AperTo (Archivio Istituzionale ad Accesso Aperto) |
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English |
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nechelyustovite Ti-disilicate mineral crystal structure EMP analysi chemical formula Group III TS block |
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nechelyustovite Ti-disilicate mineral crystal structure EMP analysi chemical formula Group III TS block CAMARA ARTIGAS, Fernando Sokolova E. From structure topology to chemical composition. X. Titanium silicates: the crystal structure and crystal chemistry of nechelyustovite, a group III Ti-disilicate mineral |
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nechelyustovite Ti-disilicate mineral crystal structure EMP analysi chemical formula Group III TS block |
description |
The crystal structure of nechelyustovite, ideally Na(4)Ba(2)Mn(1.5)square(2.5)Ti(5)Nb(Si(2)O(7))(4)O(4)(OH)(3)F(H(2)O)(6), a 5.447(1) angstrom, b 7.157(1) angstrom, c 47.259(9) angstrom, alpha 95.759(4)degrees, beta 92.136(4)degrees, gamma 89.978(4)degrees, V 1831.7(4) angstrom(3), space group P (1) over bar, Z = 2, D(calc). 3.041 g cm(-3), from Lovozero alkaline massif, Kola Peninsula, Russia, has been solved and refined to R(1) = 13.9% on the basis of 1745 unique reflections (F(o) > 15 sigma F). Electron microprobe analysis yielded the empirical formula (Na(4.21)Mn(1.11)(2+)Ca(0.46)square(1.22))(Sigma 7.00) (Ba(1.28)Sr(0.50)K(0.30)square(0.92))(Sigma 3.00)(Ti(4.14)Nb(1.43)Mn(0.33)(2+)Fe(0.06)(3+)Al(0.04))(Sigma 6.00)(Si(8.03)O(28))O(3.99)[(OH)(2.94)F(1.06)](Sigma 4.00) (H(2)O)(6.01), Z = 2, calculated on the basis of 42 (O + F) a.p.f.u, H(2)O and OH are calculated from structure refinement (H(2)O = 6 p.f.u.; F + OH = 4 p.f.u.). The crystal structure of nechelyustovite 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 Group III (Ti = 3 a. p.f.u.) of Ti-disilicate minerals: two H sheets connect to the O sheet such that two (Si(2)O(7)) groups link to the trans edges of a Ti octahedron of the O sheet. There are two distinct TS blocks of the same topology, TS(1) and TS(2), that differ in the cations of the O sheet, [(Na(1.5)Mn(1)square(0.5))Ti] and [(Na(2)Mn(0.5)square(0.5))Ti] (4 a.p.f.u.) respectively. The TS(1) and TS(2) blocks have two different H sheets, H(1,2) and H(3,4), where (Si(2)O(7)) groups link to [5]- and [6]-coordinated (Ti, Nb) polyhedra respectively. There are three peripheral sites, A(P)(1-3), occupied mainly by Ba (less Sr and K) at 96, 86 and 26% and one peripheral site A(P)(4) occupied by Na at 50%. There are two I blocks: the I(1) block is a layer of Ba atoms; the I(2) block consists of H2O groups and A(P)(3) atoms. TS blocks ... |
author2 |
Cámara F Sokolova E |
format |
Article in Journal/Newspaper |
author |
CAMARA ARTIGAS, Fernando Sokolova E. |
author_facet |
CAMARA ARTIGAS, Fernando Sokolova E. |
author_sort |
CAMARA ARTIGAS, Fernando |
title |
From structure topology to chemical composition. X. Titanium silicates: the crystal structure and crystal chemistry of nechelyustovite, a group III Ti-disilicate mineral |
title_short |
From structure topology to chemical composition. X. Titanium silicates: the crystal structure and crystal chemistry of nechelyustovite, a group III Ti-disilicate mineral |
title_full |
From structure topology to chemical composition. X. Titanium silicates: the crystal structure and crystal chemistry of nechelyustovite, a group III Ti-disilicate mineral |
title_fullStr |
From structure topology to chemical composition. X. Titanium silicates: the crystal structure and crystal chemistry of nechelyustovite, a group III Ti-disilicate mineral |
title_full_unstemmed |
From structure topology to chemical composition. X. Titanium silicates: the crystal structure and crystal chemistry of nechelyustovite, a group III Ti-disilicate mineral |
title_sort |
from structure topology to chemical composition. x. titanium silicates: the crystal structure and crystal chemistry of nechelyustovite, a group iii ti-disilicate mineral |
publishDate |
2009 |
url |
http://hdl.handle.net/2318/79622 https://doi.org/10.1180/minmag.2009.073.5.753 http://www.ingentaconnect.com/content/minsoc/mag/2009/00000073/00000005/art00004?crawler=true |
genre |
kola peninsula |
genre_facet |
kola peninsula |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000272804200004 volume:73 firstpage:753 lastpage:775 numberofpages:23 journal:MINERALOGICAL MAGAZINE http://hdl.handle.net/2318/79622 doi:10.1180/minmag.2009.073.5.753 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-71449094973 http://www.ingentaconnect.com/content/minsoc/mag/2009/00000073/00000005/art00004?crawler=true |
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info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1180/minmag.2009.073.5.753 |
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