A spinel to beta-phase transformation mechanism in /Mg, Fe/2SiO4

Details A spinel to beta-phase transformation mechanism in /Mg, Fe/2SiO4 A spinel to beta-phase transformation mechanism in /Mg, Fe/2SiO4

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.296..729p&link_type=abstract

Nature, vol. 296, Apr. 22, 1982, p. 729-731.

Physics

31

Chondrites, Meteoritic Microstructures, Olivine, Phase Transformations, Spinel, Body Centered Cubic Lattices, Electron Microscopy, Polymorphism

Scientific paper

The mechanisms of such structural changes occurring in olivine as a function of increasing pressure, and involving the formation of the beta-phase and the spinel structure gamma-phase polymorphs are important because of their effect on the properties of the mantle zone in which they occur. Although intergrowths of reactant and product phases have been produced experimentally, direct observations have been made on natural material from shock-produced veins in chondritic meteorites only. Observations are now reported concerning the natural, high-density polymorphs of olivine found in the Peace River meteorite, revealing that the spinel-to-beta-phase transformation mechanism involves the topotactic replacement of the spinel polymorph by single beta-phase grains.

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