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Science 21 May 1965:
Vol. 148. no. 3673, pp. 1090 - 1091
DOI: 10.1126/science.148.3673.1090
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Articles

Clinoenstatite: High-Low Inversion

A. J. Perrotta 1 and D. A. Stephenson 1

1 Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois

Clinoenstatite undergoes a metastable displacive inversion at 995°C. The new phase can be indexed (from x-ray powder pattern) on a triclinic cell with dimensions a = 10.00 Å; b = 8.934 Å; c = 5.170 Å; alpha = 88.27°; beta = 70.03°; gamma = 91.09°. The new phase persists from 995° to 1010°C at the composition MgSiO3. For a solid solution (15 percent by weight) of diopside in clinoenstatite, the new phase persists from 995° to at least 1400°C and does not invert in periods of several hours to protoenstatite, the phase previously thought to be the stable form in this region.


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