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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Main Authors: CAMARA ARTIGAS, Fernando, Sokolova E, Hawthorne FC, Rowe R, Grice J, Tait K.
Other Authors: Cámara F, Tait K
Format: Conference Object
Language:English
Published: 2011
Subjects:
Online Access:http://hdl.handle.net/2318/91950
http://journals.iucr.org/a/issues/2011/a1/00/a48236/a48236.pdf
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spelling 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)
institution Open Polar
collection 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
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