Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
American Mineralogist Signup for GSW Email News
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
American Mineralogist; April 2004; v. 89; no. 4; p. 640-646
© 2004 Mineralogical Society of America
This Article
Right arrow Figures Only
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Web of Science (8)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Iezzi, G.
Right arrow Articles by Holtz, F.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Synthesis and crystal-chemistry of Na(NaMg)Mg5Si8O22(OH)2, a P21/m amphibole

Gianluca Iezzi1,2,{dagger}, Giancarlo Della Ventura2,*, Roberta Oberti3, Fernando Cámara3 and François Holtz4

1 Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
2 Dipartimento di Scienze Geologiche, Università di Roma Tre, Largo S. Leonardo Murialdo 1, I-00146 Roma, Italy
3 CNR-Istituto di Geoscienze e Georisorse, sezione di Pavia, via Ferrata 1, I-27100 Pavia, Italy
4 Institut für Mineralogie, Universität Hannover, Welfengarten 1, D-30167, Germany

Correspondence: * E-mail: dellaven{at}uniroma3.it

In the present work, we characterize the amphibole Na(NaMg)Mg5Si8O22(OH)2 synthesized at 0.4 GPa and 750, 800, and 850 °C, and 0.5 GPa, 900 °C. Experiments at 800 and 900 °C yielded crystals suitable for single-crystal data collection. Structure refinement shows that synthetic Na(NaMg)Mg5Si8O22(OH)2 has P21/m symmetry at room T. The two non-equivalent tetrahedral double-chains differ in their degree of stretching and kinking. The infrared spectrum of synthetic Na(NaMg)Mg5Si8O22(OH)2 has two well-defined absorption bands at 3742 and 3715 cm–1 which can be assigned to O-H bands associated with the two independent anion sites (O3A and O3B) in the structure. The higher frequency band is assigned to the shorter O3B-H2 bond, and the lower frequency band is assigned to the longer O3A-H1 bond. The broader shape of the 3743 cm–1 band is consistent with a stronger interaction of the H2 atom with ANa, which is confirmed by structure refinement. Increasing T of synthesis causes a progressive departure from the ideal stoichiometry via the A{square}1 BMg1 ANa–1 BNa–1 substitution, as confirmed by EMPA, structure refinement, and FTIR spectroscopy.




This article has been cited by other articles:


Home page
 American MineralogistHome page
B. E. Ams, D. M. Jenkins, J. Boerio-Goates, R. M. Morcos, A. Navrotsky, and K. N. Bozhilov
Thermochemistry of a synthetic Na-Mg-rich triple-chain silicate: Determination of thermodynamic variables
American Mineralogist, August 1, 2009; 94(8-9): 1242 - 1254.
[Abstract] [Full Text] [PDF]

Home page
 Eur J MineralHome page
G. D. Ventura, F. Bellatreccia, G. Iezzi, R. Oberti, and F. Camara
The P21/m-C2/m phase transition in synthetic amphiboles in the system Li2O-Na2O-MgO-SiO2-H2O: a high-T FTIR study
European Journal of Mineralogy, December 1, 2008; 20(6): 1019 - 1026.
[Abstract] [Full Text] [PDF]

Home page
 Reviews in Mineralogy and GeochemistryHome page
F. C. Hawthorne and R. Oberti
Classification of the Amphiboles
Reviews in Mineralogy and Geochemistry, October 1, 2007; 67(1): 55 - 88.
[Full Text] [PDF]

Home page
 Reviews in Mineralogy and GeochemistryHome page
R. Oberti, G. D. Ventura, and F. Camara
New Amphibole Compositions: Natural and Synthetic
Reviews in Mineralogy and Geochemistry, October 1, 2007; 67(1): 89 - 124.
[Full Text] [PDF]

Home page
 Mineral MagHome page
G. Iezzi, G. D. Ventura, F. Bellatreccia, S. L. Mastro, B. R. Bandli, and M. E. Gunter
Site occupancy in richterite-winchite from Libby, Montana, USA, by FTIR spectroscopy
Mineralogical Magazine, February 1, 2007; 71(1): 93 - 104.
[Abstract] [Full Text] [PDF]

Home page
 Can MineralHome page
F. C. Hawthorne and R. Oberti
ON THE CLASSIFICATION OF AMPHIBOLES
Can Mineral, February 1, 2006; 44(1): 1 - 21.
[Abstract] [Full Text] [PDF]

Home page
 American MineralogistHome page
G. Iezzi, G. D. Ventura, and M. Tribaudino
Synthetic P21/m amphiboles in the system Li2O-Na2O-MgO-SiO2-H2O (LNMSH)
American Mineralogist, February 1, 2006; 91(2-3): 425 - 429.
[Abstract] [Full Text] [PDF]

Home page
 American MineralogistHome page
G. Iezzi, Z. Liu, and G. D. Ventura
Synchrotron infrared spectroscopy of synthetic Na(NaMg)Mg5Si8O22(OH)2 up to 30 GPa: Insight on a new high-pressure amphibole polymorph
American Mineralogist, February 1, 2006; 91(2-3): 479 - 482.
[Abstract] [Full Text] [PDF]

Home page
 American MineralogistHome page
G. Iezzi, G.D. Gatta, W. Kockelmann, G. D. Ventura, R. Rinaldi, W. Schafer, M. Piccinini, and F. Gaillard
Low-T neutron powder-diffraction and synchrotron-radiation IR study of synthetic amphibole Na(NaMg)Mg5Si8O22(OH)2
American Mineralogist, April 1, 2005; 90(4): 695 - 700.
[Abstract] [Full Text] [PDF]

Home page
 American MineralogistHome page
F. Camara, F. Camara, R. Oberti, G. Della Ventura, M. D. Welch, and W. V. Maresch
The crystal-structure of synthetic NaNa2Mg5Si8O21(OH)3, a triclinic C amphibole with a triple-cell and excess hydrogen
American Mineralogist, October 1, 2004; 89(10): 1464 - 1473.
[Abstract] [Full Text] [PDF]


JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2009 by Mineralogical Society of America