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A Monoclinic Post-Stishovite Polymorph of Silica in the Shergotty Meteorite

A post-stishovite phase of silica was identified in the Shergotty meteorite by x-ray diffraction and field emission scanning electron microscopy. The diffraction pattern revealed a monoclinic lattice, similar to the baddeleyite-structured polymorph with the cell parameters a = 4.375(1) angstroms, b... Full description

Journal Title: Science 02 June 2000, Vol.288(5471), pp.1632-1634
Main Author: El Goresy, Ahmed
Other Authors: Dubrovinsky, Leonid , Sharp, Thomas G. , Saxena, Surendra K. , Chen, Ming
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 00368075 ; E-ISSN: 10959203
Link: https://www.jstor.org/stable/3075480
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title: A Monoclinic Post-Stishovite Polymorph of Silica in the Shergotty Meteorite
format: Article
creator:
  • El Goresy, Ahmed
  • Dubrovinsky, Leonid
  • Sharp, Thomas G.
  • Saxena, Surendra K.
  • Chen, Ming
subjects:
  • Physical sciences -- Earth sciences -- Geology
  • Physical sciences -- Earth sciences -- Geology
  • Physical sciences -- Astronomy -- Astronomical objects
  • Physical sciences -- Physics -- Mechanics
  • Physical sciences -- Physics -- Microphysics
  • Applied sciences -- Electronics -- Electronics engineering
  • Applied sciences -- Materials science -- Materials
  • Physical sciences -- Physics -- Mechanics
  • Physical sciences -- Physics -- Microphysics
  • Applied sciences -- Materials science -- Materials
ispartof: Science, 02 June 2000, Vol.288(5471), pp.1632-1634
description: A post-stishovite phase of silica was identified in the Shergotty meteorite by x-ray diffraction and field emission scanning electron microscopy. The diffraction pattern revealed a monoclinic lattice, similar to the baddeleyite-structured polymorph with the cell parameters a = 4.375(1) angstroms, b = 4.584(1) angstroms, c = 4.708(1) angstroms, β= 99.97(3), ρ = 4.30(2) grams per cubic centimeter, where the numbers in parentheses are the maximum deviations. Transmission electron microscopy investigations indicate the presence of the α-lead dioxide-like polymorph, stishovite, and secondary cristobalite in the same silica grain. The mixture of high-density polymorphs suggests that several post-stishovite phases were formed during the shock event on the Shergotty parent body.
language: eng
source:
identifier: ISSN: 00368075 ; E-ISSN: 10959203
fulltext: fulltext
issn:
  • 0036-8075
  • 00368075
  • 1095-9203
  • 10959203
url: Link


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titleA Monoclinic Post-Stishovite Polymorph of Silica in the Shergotty Meteorite
creatorEl Goresy, Ahmed ; Dubrovinsky, Leonid ; Sharp, Thomas G. ; Saxena, Surendra K. ; Chen, Ming
ispartofScience, 02 June 2000, Vol.288(5471), pp.1632-1634
identifierISSN: 00368075 ; E-ISSN: 10959203
subjectPhysical sciences -- Earth sciences -- Geology ; Physical sciences -- Earth sciences -- Geology ; Physical sciences -- Astronomy -- Astronomical objects ; Physical sciences -- Physics -- Mechanics ; Physical sciences -- Physics -- Microphysics ; Applied sciences -- Electronics -- Electronics engineering ; Applied sciences -- Materials science -- Materials ; Physical sciences -- Physics -- Mechanics ; Physical sciences -- Physics -- Microphysics ; Applied sciences -- Materials science -- Materials
descriptionA post-stishovite phase of silica was identified in the Shergotty meteorite by x-ray diffraction and field emission scanning electron microscopy. The diffraction pattern revealed a monoclinic lattice, similar to the baddeleyite-structured polymorph with the cell parameters a = 4.375(1) angstroms, b = 4.584(1) angstroms, c = 4.708(1) angstroms, β= 99.97(3), ρ = 4.30(2) grams per cubic centimeter, where the numbers in parentheses are the maximum deviations. Transmission electron microscopy investigations indicate the presence of the α-lead dioxide-like polymorph, stishovite, and secondary cristobalite in the same silica grain. The mixture of high-density polymorphs suggests that several post-stishovite phases were formed during the shock event on the Shergotty parent body.
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descriptionA post-stishovite phase of silica was identified in the Shergotty meteorite by x-ray diffraction and field emission scanning electron microscopy. The diffraction pattern revealed a monoclinic lattice, similar to the baddeleyite-structured polymorph with the cell parameters a = 4.375(1) angstroms, b = 4.584(1) angstroms, c = 4.708(1) angstroms, β= 99.97(3), ρ = 4.30(2) grams per cubic centimeter, where the numbers in parentheses are the maximum deviations. Transmission electron microscopy investigations indicate the presence of the α-lead dioxide-like polymorph, stishovite, and secondary cristobalite in the same silica grain. The mixture of high-density polymorphs suggests that several post-stishovite phases were formed during the shock event on the Shergotty parent body.
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abstractA post-stishovite phase of silica was identified in the Shergotty meteorite by x-ray diffraction and field emission scanning electron microscopy. The diffraction pattern revealed a monoclinic lattice, similar to the baddeleyite-structured polymorph with the cell parameters a = 4.375(1) angstroms, b = 4.584(1) angstroms, c = 4.708(1) angstroms, β= 99.97(3), ρ = 4.30(2) grams per cubic centimeter, where the numbers in parentheses are the maximum deviations. Transmission electron microscopy investigations indicate the presence of the α-lead dioxide-like polymorph, stishovite, and secondary cristobalite in the same silica grain. The mixture of high-density polymorphs suggests that several post-stishovite phases were formed during the shock event on the Shergotty parent body.
pubAmerican Society for the Advancement of Science
doi10.1126/science.288.5471.1632
date2000-06-02