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

Science  17 Apr 1970:
Vol. 168, Issue 3929, pp. 364-367
DOI: 10.1126/science.168.3929.364


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.