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Science 5 April 1968:
Vol. 160. no. 3823, pp. 66 - 67
DOI: 10.1126/science.160.3823.66
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Articles

Olivine-Garnet Transformation in a Meteorite

Brian Mason 1, J. Nelen 1, and John S. White Jr. 1

1 U.S. National Museum, Washington, D.C. 20560

Garnet has been identified for the first time as a meteorite mineral in the Coorara chondrite from Western Australia. It replaces olivine grains in a 1-millimeter veinlet traversing the body of the meteorite. The associated olivine has abnormally low birefringence, which suggests a highly shocked condition. Microprobe analyses do not distinguish the garnet from the associated olivine, which has the composition (Mg.75Fe.25)2 SiO4; the garnet may have the composition Mg3Fe2Si3O12 but be unresolvable from the accompanying olivine, or alternatively is nonstoichiometric. Transformation of olivine to garnet under high pressure could have significant implications for the phase composition of the Earth's mantle.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Microstructures and structural phase transition in (Mg,Fe)SiO3 majorite.
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Dislocations in meteoritic and synthetic majorite garnets.
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European Journal of Mineralogy 12, 695-702
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Pyroxene-Garnet Transformation in Coorara Meteorite.
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Science 168, 832-833
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Discovery of the Garnet, Khoharite?.
D. Mcconnell and D. McConnell (1969)
Science 163, 828-829
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Alternative Explanation of the Garnet Occurrence in a Meteorite.
S. Geller and S. Geller (1969)
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