...Anna Pakhomova; Leyla Ismailova; Elena Bykova; Maxim Bykov; Tiziana Boffa Ballaran; Leonid Dubrovinsky Abstract Synchrotron-based high-pressure single-crystal X-ray diffraction experiments were conducted on synthetic pure clinoferrosilite, Fe 2 Si 2 O 6 , at room temperature to a maximum pressure...

... shows that the ultrafine lamellae do not contain orthopyroxene but are instead composed of magnesian clinoferrosilite (En 45 Fs 55 ), and lesser ferroan spinel and anorthite. The clinoferrosilite is probably the inversion product of initially-formed magnesian protoferrosilite. The breakdown reaction...

...Nancy L. Ross; John R. Sowerby Abstract Electronic absorption spectra of a single crystal of clinoferrosilite, FeSiO 3 , have been collected between 4,000 and 15,000 cm (super -1) from room pressure to 4.8 GPa. Four bands are observed in all of the spectra: two peaks near 11,000 cm (super -1...

...Shigeho Sueno; Mitsuyoshi Kimata; Charles T. Prewitt Abstract The crystal structure of high clinoferrosilite (FeSiO 3 ) with C 2/ c symmetry after the transition from orthoferrosilite at 1025°C was determined at 1050°C using a high-temperature four-circle diffractometer. The cell constants...

...Figure 3 Variation of QS with pressure for high-pressure C 2/ c clinoferrosilite (data are from McCammon and Tennant 1996 ). The dashed and solid lines are linear least-square fits by McCammon and Tennant (1996) and this study, respectively, to estimate the QS at 0 GPa for Fe 2+ at the M1...

... ) is recorded where metamorphic overprint is minimal. Mineral phases of gabbro-anorthosite rocks suggest that clinopyroxene compositions from gabrro correspond to diopside and clinoferrosilite, while those from anorthosite are clinoferrosilite. Amphiboles from the gabbro-anorthosite rocks are calcic, and range...