Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
American Mineralogist Email Content Delivery
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
American Mineralogist; July 2002; v. 87; no. 7; p. 1018-1023
© 2002 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 (19)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Dera, P.
Right arrow Articles by Hemley, R. J.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Letter

Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty

Przemyslaw Dera*, Charles T. Prewitt, Nabil Z. Boctor and Russell J. Hemley

Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Road, N.W., Washington, D.C. 20015, U.S.A.

Correspondence: * E-mail: pdera{at}gl.ciw.edu

Recently, there has been substantial interest in post-stishovite high-pressure polymorphs of SiO2, discovered as extraterrestrial minerals, or synthesized in the laboratory. Previous investigators reported the presence of "{alpha}-PbO2-like" and "baddeleyite-like" SiO2 in the Martian meteorite Shergotty, and also the synthesis of an {alpha}-PbO2-like phase at pressures of 60–80 GPa in a laser-heated diamond anvil cell. To provide definitive information about the nature of the natural "{alpha}-PbO2 phase," we recovered a small sample from the Shergotty meteorite, obtained powder X-ray diffraction patterns, and performed a Rietveld refinement of the structure. The resulting cell parameters and space group are a = 4.097(1) Å, b = 5.0462(9) Å, c = 4.4946(8) Å, and Pbcn. The structure refinement confirms that this sample does have the {alpha}-PbO2 structure.




This article has been cited by other articles:


Home page
 Proc. Natl. Acad. Sci. USAHome page
O. Tschauner, P. D. Asimow, N. Kostandova, T. J. Ahrens, C. Ma, S. Sinogeikin, Z. Liu, S. Fakra, and N. Tamura
Ultrafast growth of wadsleyite in shock-produced melts and its implications for early solar system impact processes
PNAS, August 18, 2009; 106(33): 13691 - 13695.
[Abstract] [Full Text] [PDF]

Home page
 Eur J MineralHome page
A. El Goresy, P. Dera, T. G. Sharp, C. T. Prewitt, M. Chen, L. Dubrovinsky, B. Wopenka, N. Z. Boctor, and R. J. Hemley
Seifertite, a dense orthorhombic polymorph of silica from the Martian meteorites Shergotty and Zagami
European Journal of Mineralogy, August 1, 2008; 20(4): 523 - 528.
[Abstract] [Full Text] [PDF]

Home page
 American MineralogistHome page
O. Tschauner, S.-N. Luo, P. D. Asimow, and T. J. Ahrens
Recovery of stishovite-structure at ambient conditions out of shock-generated amorphous silica
American Mineralogist, November 1, 2006; 91(11-12): 1857 - 1862.
[Abstract] [Full Text] [PDF]

Home page
 American MineralogistHome page
S.-N. Luo, S.-N. Luo, O. Tschauner, P. D. Asimow, and T. J. Ahrens
A new dense silica polymorph: A possible link between tetrahedrally and octahedrally coordinated silica
American Mineralogist, February 1, 2004; 89(2-3): 455 - 461.
[Abstract] [Full Text] [PDF]

Home page
 Mineral MagHome page
R. J. Hemley and H. K. Mao
New windows on earth and planetary interiors
Mineralogical Magazine, October 1, 2002; 66(5): 791 - 811.
[Abstract] [Full Text] [PDF]


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