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Science 6 April 1973:
Vol. 180. no. 4081, pp. 64 - 66
DOI: 10.1126/science.180.4081.64
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Articles

Crystallographic Orientation of Clinoenstatite Produced by Deformation of Orthoenstatite

R. S. Coe 1 and W. F. Muller 2

1 Earth Sciences Board, University of California, Santa Cruz 95060
2 Department of Materials Science and Engineering, University of California, Berkeley 94720

Uniaxial compression at 800°C and 5 kilobars confining pressure of a specimen cored from a single crystal of orthoenstatite [(Mg,Fe)SiO3] produced fine lamellae 100 to 1000 angstroms thick of untwinned clinoenstatite. The two phases are joined along (100) planes and have b and c axes in common. The orientation of the clinoenstatite a axis contradicts several previously suggested transformation mechanisms and reduces the set of possible mechanisms by a factor of 2.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)