Macroscopic palygorskite from Lisbom Volcanic Complex

The palygorskite of the Volcanic Complex near of Lisbom (Portugal) is particular both in the size of the fibres and in chemical composition. It appears as veins of very pure mineral. From hand specimen and optical observations it can be described as a macroscopic palygorskite. The crystals are large...

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Detalles Bibliográficos
Autores: Súarez Barrios, Mercedes, García Romero, Emilia
Tipo de recurso: artículo
Fecha de publicación:2006
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/50677
Acceso en línea:https://hdl.handle.net/20.500.14352/50677
Access Level:acceso abierto
Palabra clave:549.6(469)
Palygorskite
Macrocrystalline palygorskite
Electron microscopy
Powder diffraction
FTIR spectroscopy
Mineralogía (Geología)
2506.11 Mineralogía
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oai_identifier_str oai:docta.ucm.es:20.500.14352/50677
network_acronym_str ES
network_name_str España
repository_id_str
spelling Macroscopic palygorskite from Lisbom Volcanic ComplexSúarez Barrios, MercedesGarcía Romero, Emilia549.6(469)PalygorskiteMacrocrystalline palygorskiteElectron microscopyPowder diffractionFTIR spectroscopyMineralogía (Geología)2506.11 MineralogíaThe palygorskite of the Volcanic Complex near of Lisbom (Portugal) is particular both in the size of the fibres and in chemical composition. It appears as veins of very pure mineral. From hand specimen and optical observations it can be described as a macroscopic palygorskite. The crystals are large with exfoliation traces of several hundred microns to few millimetres in length. In thin section, this palygorskite is colourless, translucent, negative biaxial, with positive elongation and parallel extinction. The optically homogeneous fibres and laths are shown by the selected area electron diffraction to be composed of aggregates of much thinner fibres rotated differently around the c crystal axis which represents their common elongation direction. The chemical formula obtained by the X-ray EDS is Si8.02O20 (Al1.91 Fe0.04 Mg 2.01) (OH)2 (OH2)4 Ca 0.01 Na 0.07 4(H2O) very close to the ideal formula of a pureMg-Al palygorskite,with almost no octahedral Fe, and noAl in tetrahedral sites. The cell parameters are a0 or a0 sin q = 12.64 A° , b0 = 17.84 A° and c0 = 5.3 A° .E. Schweizerbart'sche VerlagsbuchhandlungUniversidad Complutense de Madrid20062006-01-0120062006-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/50677reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/506772026-06-02T12:44:21Z
dc.title.none.fl_str_mv Macroscopic palygorskite from Lisbom Volcanic Complex
title Macroscopic palygorskite from Lisbom Volcanic Complex
spellingShingle Macroscopic palygorskite from Lisbom Volcanic Complex
Súarez Barrios, Mercedes
549.6(469)
Palygorskite
Macrocrystalline palygorskite
Electron microscopy
Powder diffraction
FTIR spectroscopy
Mineralogía (Geología)
2506.11 Mineralogía
title_short Macroscopic palygorskite from Lisbom Volcanic Complex
title_full Macroscopic palygorskite from Lisbom Volcanic Complex
title_fullStr Macroscopic palygorskite from Lisbom Volcanic Complex
title_full_unstemmed Macroscopic palygorskite from Lisbom Volcanic Complex
title_sort Macroscopic palygorskite from Lisbom Volcanic Complex
dc.creator.none.fl_str_mv Súarez Barrios, Mercedes
García Romero, Emilia
author Súarez Barrios, Mercedes
author_facet Súarez Barrios, Mercedes
García Romero, Emilia
author_role author
author2 García Romero, Emilia
author2_role author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 549.6(469)
Palygorskite
Macrocrystalline palygorskite
Electron microscopy
Powder diffraction
FTIR spectroscopy
Mineralogía (Geología)
2506.11 Mineralogía
topic 549.6(469)
Palygorskite
Macrocrystalline palygorskite
Electron microscopy
Powder diffraction
FTIR spectroscopy
Mineralogía (Geología)
2506.11 Mineralogía
description The palygorskite of the Volcanic Complex near of Lisbom (Portugal) is particular both in the size of the fibres and in chemical composition. It appears as veins of very pure mineral. From hand specimen and optical observations it can be described as a macroscopic palygorskite. The crystals are large with exfoliation traces of several hundred microns to few millimetres in length. In thin section, this palygorskite is colourless, translucent, negative biaxial, with positive elongation and parallel extinction. The optically homogeneous fibres and laths are shown by the selected area electron diffraction to be composed of aggregates of much thinner fibres rotated differently around the c crystal axis which represents their common elongation direction. The chemical formula obtained by the X-ray EDS is Si8.02O20 (Al1.91 Fe0.04 Mg 2.01) (OH)2 (OH2)4 Ca 0.01 Na 0.07 4(H2O) very close to the ideal formula of a pureMg-Al palygorskite,with almost no octahedral Fe, and noAl in tetrahedral sites. The cell parameters are a0 or a0 sin q = 12.64 A° , b0 = 17.84 A° and c0 = 5.3 A° .
publishDate 2006
dc.date.none.fl_str_mv 2006
2006-01-01
2006
2006-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/50677
url https://hdl.handle.net/20.500.14352/50677
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv E. Schweizerbart'sche Verlagsbuchhandlung
publisher.none.fl_str_mv E. Schweizerbart'sche Verlagsbuchhandlung
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,223283

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