A monoclinic pst-stishovite polymorph of silica in the Shergotty meteorite

Ahmed El Goresy, Leonid Dubrovinsky, Thomas Sharp, Surendra K. Saxena, Ming Chen

Research output: Contribution to journalArticle

91 Citations (Scopus)

Abstract

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), π = 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.

Original languageEnglish (US)
Pages (from-to)1632-1634
Number of pages3
JournalScience
Volume288
Issue number5471
DOIs
StatePublished - Jun 2 2000

Fingerprint

Meteorites
Polymorphism
Silicon Dioxide
Field emission
Diffraction patterns
Diffraction
Transmission electron microscopy
X rays
Scanning electron microscopy

ASJC Scopus subject areas

  • General

Cite this

El Goresy, A., Dubrovinsky, L., Sharp, T., Saxena, S. K., & Chen, M. (2000). A monoclinic pst-stishovite polymorph of silica in the Shergotty meteorite. Science, 288(5471), 1632-1634. https://doi.org/10.1126/science.288.5471.1632

A monoclinic pst-stishovite polymorph of silica in the Shergotty meteorite. / El Goresy, Ahmed; Dubrovinsky, Leonid; Sharp, Thomas; Saxena, Surendra K.; Chen, Ming.

In: Science, Vol. 288, No. 5471, 02.06.2000, p. 1632-1634.

Research output: Contribution to journalArticle

El Goresy, A, Dubrovinsky, L, Sharp, T, Saxena, SK & Chen, M 2000, 'A monoclinic pst-stishovite polymorph of silica in the Shergotty meteorite', Science, vol. 288, no. 5471, pp. 1632-1634. https://doi.org/10.1126/science.288.5471.1632
El Goresy, Ahmed ; Dubrovinsky, Leonid ; Sharp, Thomas ; Saxena, Surendra K. ; Chen, Ming. / A monoclinic pst-stishovite polymorph of silica in the Shergotty meteorite. In: Science. 2000 ; Vol. 288, No. 5471. pp. 1632-1634.
@article{b42c597577de4db7af28f7ea685ea3ab,
title = "A monoclinic pst-stishovite polymorph of silica in the Shergotty meteorite",
abstract = "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), π = 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.",
author = "{El Goresy}, Ahmed and Leonid Dubrovinsky and Thomas Sharp and Saxena, {Surendra K.} and Ming Chen",
year = "2000",
month = "6",
day = "2",
doi = "10.1126/science.288.5471.1632",
language = "English (US)",
volume = "288",
pages = "1632--1634",
journal = "Science",
issn = "0036-8075",
publisher = "American Association for the Advancement of Science",
number = "5471",

}

TY - JOUR

T1 - A monoclinic pst-stishovite polymorph of silica in the Shergotty meteorite

AU - El Goresy, Ahmed

AU - Dubrovinsky, Leonid

AU - Sharp, Thomas

AU - Saxena, Surendra K.

AU - Chen, Ming

PY - 2000/6/2

Y1 - 2000/6/2

N2 - 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), π = 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.

AB - 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), π = 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.

UR - http://www.scopus.com/inward/record.url?scp=0034595876&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034595876&partnerID=8YFLogxK

U2 - 10.1126/science.288.5471.1632

DO - 10.1126/science.288.5471.1632

M3 - Article

VL - 288

SP - 1632

EP - 1634

JO - Science

JF - Science

SN - 0036-8075

IS - 5471

ER -