Veblenite: a new ti-silicate related to HOH structures
Veblenite, ideally KNa(Fe2+5Fe3+4Mn7)Nb4(Si2O7)2(Si8O22)2 O6(OH)10(H2O)3, triclicnic, P¯1, a 5.3761(3), b 27.5062(11), c 18.6972(9) Å, α 140.301(3), β 93.033(3), γ 95.664(3)°, V 1720.96(14) Å3, has no natural or synthetic analogues. It is a new mineral occurring at Ten Mile Lake, Seal Lake area, Lab...
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ftunivtorino:oai:iris.unito.it:2318/91950 2023-10-29T02:38:02+01:00 Veblenite: a new ti-silicate related to HOH structures CAMARA ARTIGAS, Fernando Sokolova E Hawthorne FC Rowe R Grice J Tait K. Cámara F Sokolova E Hawthorne FC Rowe R Grice J Tait K 2011 ELETTRONICO http://hdl.handle.net/2318/91950 http://journals.iucr.org/a/issues/2011/a1/00/a48236/a48236.pdf eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000484219403106 XXII Congress and General Assembly of the International Union of Cristallography volume:A67 firstpage:C647 lastpage:C647 numberofpages:1 journal:ACTA CRYSTALLOGRAPHICA. SECTION A, FOUNDATIONS OF CRYSTALLOGRAPHY http://hdl.handle.net/2318/91950 http://journals.iucr.org/a/issues/2011/a1/00/a48236/a48236.pdf structure layered silicate info:eu-repo/semantics/conferenceObject 2011 ftunivtorino 2023-10-03T22:19:05Z Veblenite, ideally KNa(Fe2+5Fe3+4Mn7)Nb4(Si2O7)2(Si8O22)2 O6(OH)10(H2O)3, triclicnic, P¯1, a 5.3761(3), b 27.5062(11), c 18.6972(9) Å, α 140.301(3), β 93.033(3), γ 95.664(3)°, V 1720.96(14) Å3, has no natural or synthetic analogues. It is a new mineral occurring at Ten Mile Lake, Seal Lake area, Labrador, Newfoundland, Canada, as red brown single laths and fibres included in feldspar. In the crystal structure of veblenite, M octahedra share common edges to form a wavy octahedral sheet parallel to (001). SiO4 tetrahedra share corners to form Si2O7 groups and Si8O22 ribbons. This is the first occurrence of an eightmembered Si-O ribbon in a mineral crystal structure. The Nb-dominant D octahedra, Si2O7 groups and Si8O22 ribbons share common vertices to form a heteropolyhedral (H) sheet. Two H sheets and an O sheet constitute an HOH block. Along [001], HOH blocks connect via common vertices of D octahedra and cations at the A(1,2) and B interstitial sites. In the intermediate space between two adjacent HOH blocks, two [100] channels of different size can be identified. A narrow channel of the width of an Si2O7 group contains the A(1) site mainly occupied by K. A large channel has the width of four Si2O7 groups (Si8O22 ribbon) and contains A(2) sites partly occupied by K and H2O groups. The crystal structure of veblenite is related to several HOH structures where the O sheet is ideally composed of Fe2+ octahedra, such as jinshanjiangite [1], niobophyllite [2] (astrophyllite group) and nafertisite [3]. Veblenite differs from those structures in the topology and chemistry of the H sheet. In jinshajiangite, the H sheet consists of (Si2O7) groups and Ti-dominant octahedra. In niobophyllite, the H sheet is composed of (Si4O12) astrophyllite ribbons [a double ribbon of (Si2O7) groups] and Nb-dominant octahedra. In nafertisite, the H sheet is composed of (Si6O17) ribbons [a triple ribbon of (Si2O7) groups] and Ti-dominant octahedra. In veblenite, the H sheet is composed of (Si2O7) groups (as in jinshajiangite), (Si8O22) ... Conference Object Newfoundland Università degli studi di Torino: AperTo (Archivio Istituzionale ad Accesso Aperto) |
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Università degli studi di Torino: AperTo (Archivio Istituzionale ad Accesso Aperto) |
op_collection_id |
ftunivtorino |
language |
English |
topic |
structure layered silicate |
spellingShingle |
structure layered silicate CAMARA ARTIGAS, Fernando Sokolova E Hawthorne FC Rowe R Grice J Tait K. Veblenite: a new ti-silicate related to HOH structures |
topic_facet |
structure layered silicate |
description |
Veblenite, ideally KNa(Fe2+5Fe3+4Mn7)Nb4(Si2O7)2(Si8O22)2 O6(OH)10(H2O)3, triclicnic, P¯1, a 5.3761(3), b 27.5062(11), c 18.6972(9) Å, α 140.301(3), β 93.033(3), γ 95.664(3)°, V 1720.96(14) Å3, has no natural or synthetic analogues. It is a new mineral occurring at Ten Mile Lake, Seal Lake area, Labrador, Newfoundland, Canada, as red brown single laths and fibres included in feldspar. In the crystal structure of veblenite, M octahedra share common edges to form a wavy octahedral sheet parallel to (001). SiO4 tetrahedra share corners to form Si2O7 groups and Si8O22 ribbons. This is the first occurrence of an eightmembered Si-O ribbon in a mineral crystal structure. The Nb-dominant D octahedra, Si2O7 groups and Si8O22 ribbons share common vertices to form a heteropolyhedral (H) sheet. Two H sheets and an O sheet constitute an HOH block. Along [001], HOH blocks connect via common vertices of D octahedra and cations at the A(1,2) and B interstitial sites. In the intermediate space between two adjacent HOH blocks, two [100] channels of different size can be identified. A narrow channel of the width of an Si2O7 group contains the A(1) site mainly occupied by K. A large channel has the width of four Si2O7 groups (Si8O22 ribbon) and contains A(2) sites partly occupied by K and H2O groups. The crystal structure of veblenite is related to several HOH structures where the O sheet is ideally composed of Fe2+ octahedra, such as jinshanjiangite [1], niobophyllite [2] (astrophyllite group) and nafertisite [3]. Veblenite differs from those structures in the topology and chemistry of the H sheet. In jinshajiangite, the H sheet consists of (Si2O7) groups and Ti-dominant octahedra. In niobophyllite, the H sheet is composed of (Si4O12) astrophyllite ribbons [a double ribbon of (Si2O7) groups] and Nb-dominant octahedra. In nafertisite, the H sheet is composed of (Si6O17) ribbons [a triple ribbon of (Si2O7) groups] and Ti-dominant octahedra. In veblenite, the H sheet is composed of (Si2O7) groups (as in jinshajiangite), (Si8O22) ... |
author2 |
Cámara F Sokolova E Hawthorne FC Rowe R Grice J Tait K |
format |
Conference Object |
author |
CAMARA ARTIGAS, Fernando Sokolova E Hawthorne FC Rowe R Grice J Tait K. |
author_facet |
CAMARA ARTIGAS, Fernando Sokolova E Hawthorne FC Rowe R Grice J Tait K. |
author_sort |
CAMARA ARTIGAS, Fernando |
title |
Veblenite: a new ti-silicate related to HOH structures |
title_short |
Veblenite: a new ti-silicate related to HOH structures |
title_full |
Veblenite: a new ti-silicate related to HOH structures |
title_fullStr |
Veblenite: a new ti-silicate related to HOH structures |
title_full_unstemmed |
Veblenite: a new ti-silicate related to HOH structures |
title_sort |
veblenite: a new ti-silicate related to hoh structures |
publishDate |
2011 |
url |
http://hdl.handle.net/2318/91950 http://journals.iucr.org/a/issues/2011/a1/00/a48236/a48236.pdf |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000484219403106 XXII Congress and General Assembly of the International Union of Cristallography volume:A67 firstpage:C647 lastpage:C647 numberofpages:1 journal:ACTA CRYSTALLOGRAPHICA. SECTION A, FOUNDATIONS OF CRYSTALLOGRAPHY http://hdl.handle.net/2318/91950 http://journals.iucr.org/a/issues/2011/a1/00/a48236/a48236.pdf |
_version_ |
1781063651810082816 |