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

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

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000sci...288.1632e&link_type=abstract

Science, Volume 288, Issue 5471, pp. 1632-1635 (2000).

Physics

21

Scientific paper

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.

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