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Science 17 April 1970:
Vol. 168. no. 3929, pp. 364 - 367
DOI: 10.1126/science.168.3929.364
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Articles

Pyroxferroite: Stability and X-ray Crystallography of Synthetic Ca0.15Fe0.85SiO3 Pyroxenoid

Donald H. Lindsley 1 and Charles W. Burnham 2

1 Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20008
2 Department of Geological Sciences, Harvard University, Cambridge, Massachusetts 02138

Synthetic Ca0.15Fe0.85SiO3 pyroxenoid has the same (pyroxmangite) structure and very nearly the same composition as pyroxferroite, a new mineral found in Apollo 11 lunar samples. The synthetic material is not stable below pressures of approximately 10 kilobars. It appears likely that the lunar pyroxferroite has persisted in a metastable state for some billions of years.


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