Sodian muscovite-2M1: crystal chemistry and surface features
his study explores crystal chemical features of a sodian muscovite from Antarctica, both in the bulk of the mineral and at the uppermost surface layers. These features may support a deeper comprehension of processes affecting mineral surface and mineral physical properties. The muscovite under analy...
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ftunivmodena:oai:iris.unimore.it:11380/970902 2024-02-11T09:57:24+01:00 Sodian muscovite-2M1: crystal chemistry and surface features ELMI, Chiara BRIGATTI, Maria Franca PASQUALI, Luca MONTECCHI, Monica MALFERRARI, Daniele NANNARONE, Stefano Guggenheim, S. Elmi, Chiara Brigatti, Maria Franca Guggenheim, S. Pasquali, Luca Montecchi, Monica Malferrari, Daniele Nannarone, Stefano 2013 STAMPA http://hdl.handle.net/11380/970902 https://doi.org/10.3749/canmin.51.1.5 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000317586600003 volume:51 firstpage:5 lastpage:14 journal:CANADIAN MINERALOGIST http://hdl.handle.net/11380/970902 doi:10.3749/canmin.51.1.5 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84876962066 info:eu-repo/semantics/closedAccess Crystal chemistry CRYSTAL STRUCTURE muscovite surfaces info:eu-repo/semantics/article 2013 ftunivmodena https://doi.org/10.3749/canmin.51.1.5 2024-01-23T23:21:32Z his study explores crystal chemical features of a sodian muscovite from Antarctica, both in the bulk of the mineral and at the uppermost surface layers. These features may support a deeper comprehension of processes affecting mineral surface and mineral physical properties. The muscovite under analysis is characterized by limited celadonite and paragonite substitutions and shows the following chemical formula: [XII](K1.73 Na0.27) [VI](Fe2+ 0.14 Al3+ 3.77 Mg 0.07 Ti0.01) [IV](Al1.91 Si6.09) O20 (F0.11 OH3.89). The sample is monoclinic, 2M1 polytype, with symmetry C2/c and unit cell parameters a = 5.1969(1), b = 9.0138(3), c = 20.0835(7) A, and β = 95.763(2)°. The two tetrahedral sites, T1 and T2, present similar distances (>T1.O< = 1.643A and >T2.O< = 1.647 A) and distortion parameter values, evidencing a disordered distribution of Si and Al at tetrahedral sites. The tetrahedral ring is significantly distorted (α = 11.2°) and the tetrahedral basal oxygen atom plane is remarkably wavy (δz = 0.224 A).Crystal chemical modifications at mineral surface were investigated by X-ray photoelectron spectroscopy. The interlayer cation K is eight-fold coordinated both in the bulk and at the surface, and its amount decreases at the surface. Sodium substitutes K and its coordination at the mineral surface is six. This evidence, together with a significant Na increase at the surface, is consistent with Na clustering close to the cleavage plane. Article in Journal/Newspaper Antarc* Antarctica Archivio della ricerca dell'Università di Modena e Reggio Emilia (Unimore: IRIS) The Canadian Mineralogist 51 1 5 14 |
institution |
Open Polar |
collection |
Archivio della ricerca dell'Università di Modena e Reggio Emilia (Unimore: IRIS) |
op_collection_id |
ftunivmodena |
language |
English |
topic |
Crystal chemistry CRYSTAL STRUCTURE muscovite surfaces |
spellingShingle |
Crystal chemistry CRYSTAL STRUCTURE muscovite surfaces ELMI, Chiara BRIGATTI, Maria Franca PASQUALI, Luca MONTECCHI, Monica MALFERRARI, Daniele NANNARONE, Stefano Guggenheim, S. Sodian muscovite-2M1: crystal chemistry and surface features |
topic_facet |
Crystal chemistry CRYSTAL STRUCTURE muscovite surfaces |
description |
his study explores crystal chemical features of a sodian muscovite from Antarctica, both in the bulk of the mineral and at the uppermost surface layers. These features may support a deeper comprehension of processes affecting mineral surface and mineral physical properties. The muscovite under analysis is characterized by limited celadonite and paragonite substitutions and shows the following chemical formula: [XII](K1.73 Na0.27) [VI](Fe2+ 0.14 Al3+ 3.77 Mg 0.07 Ti0.01) [IV](Al1.91 Si6.09) O20 (F0.11 OH3.89). The sample is monoclinic, 2M1 polytype, with symmetry C2/c and unit cell parameters a = 5.1969(1), b = 9.0138(3), c = 20.0835(7) A, and β = 95.763(2)°. The two tetrahedral sites, T1 and T2, present similar distances (>T1.O< = 1.643A and >T2.O< = 1.647 A) and distortion parameter values, evidencing a disordered distribution of Si and Al at tetrahedral sites. The tetrahedral ring is significantly distorted (α = 11.2°) and the tetrahedral basal oxygen atom plane is remarkably wavy (δz = 0.224 A).Crystal chemical modifications at mineral surface were investigated by X-ray photoelectron spectroscopy. The interlayer cation K is eight-fold coordinated both in the bulk and at the surface, and its amount decreases at the surface. Sodium substitutes K and its coordination at the mineral surface is six. This evidence, together with a significant Na increase at the surface, is consistent with Na clustering close to the cleavage plane. |
author2 |
Elmi, Chiara Brigatti, Maria Franca Guggenheim, S. Pasquali, Luca Montecchi, Monica Malferrari, Daniele Nannarone, Stefano |
format |
Article in Journal/Newspaper |
author |
ELMI, Chiara BRIGATTI, Maria Franca PASQUALI, Luca MONTECCHI, Monica MALFERRARI, Daniele NANNARONE, Stefano Guggenheim, S. |
author_facet |
ELMI, Chiara BRIGATTI, Maria Franca PASQUALI, Luca MONTECCHI, Monica MALFERRARI, Daniele NANNARONE, Stefano Guggenheim, S. |
author_sort |
ELMI, Chiara |
title |
Sodian muscovite-2M1: crystal chemistry and surface features |
title_short |
Sodian muscovite-2M1: crystal chemistry and surface features |
title_full |
Sodian muscovite-2M1: crystal chemistry and surface features |
title_fullStr |
Sodian muscovite-2M1: crystal chemistry and surface features |
title_full_unstemmed |
Sodian muscovite-2M1: crystal chemistry and surface features |
title_sort |
sodian muscovite-2m1: crystal chemistry and surface features |
publishDate |
2013 |
url |
http://hdl.handle.net/11380/970902 https://doi.org/10.3749/canmin.51.1.5 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000317586600003 volume:51 firstpage:5 lastpage:14 journal:CANADIAN MINERALOGIST http://hdl.handle.net/11380/970902 doi:10.3749/canmin.51.1.5 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84876962066 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.3749/canmin.51.1.5 |
container_title |
The Canadian Mineralogist |
container_volume |
51 |
container_issue |
1 |
container_start_page |
5 |
op_container_end_page |
14 |
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1790609703461453824 |