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Structuredeformationsinducedbypressureandtemperatureinsynthetic!fi!fiCs-tetra-ferr2 3 3annite!fl!fl1M[ (Fe Fe )(Si Fe Al )O (OH) ],spacegroup C2/m, werean-1.78 6.15 0.05 20 45.93 0.07 1.80 alyzedtoi...
Single-crystalX-raydiffractionwasperformedinsituat T 20,230,465,and700C Si O , I2/c,a 8.402, b 13.043, c 14.308 onapartiallyorderedleadfeldspar(PbAl2 2 8351?? A, 115.30, V 1417.6A ; Q 0.71).Theunit...
25Mg NMR spectra for several silicate and aluminosilicate melts were obtained from 1000–1470 8C. The peaks are initially very broad, but narrow with increasing temperature to near 500 Hz at the highes...
Incommensurate tridymite L3-TO(MX-1) shows a cascade of five phase transitions at 65,110, 150, 200, and 380 8C upon heating. The X-ray diffraction patterns were investigated with a Buerger precession ...
The crystal structures and M-site populations of a series of unheated and heat-treated,near-binary members of the actinolite series were determined from single-crystal X-ray diffraction data. Small, s...
Two analcimes of hydrothermal and diagenetic origin were investigated by in situ29Si,27Al, and 23 Na NMR from room temperature to 550 8 C, and by TGA and DSC. The two samples dehydrate at different te...
ThepositionaldisorderofMg andAl cationsbetweenthetetrahedralandoctahedralsitesinnaturalMgAlO spinelhasbeeninvestigatedby AlMASNMRatroomtem-2 427peratureandin-situhigh-temperatureAlNMRspectroscopyupto1...
Memory effects ass~iated with the Dauphine twins in a quartz and the c-antiphase domains (c-APDs) in PI anorthite have been investigated by in situ hot-stage transmission electron microscopy (TEM). ...
Anovel type ofhigh-temperature, high-pressure cell has been designed for near-infrared and optical spectroscopy of hydrous silicate meltsat pressures up to 3 kbar and temper-atures up to 800 0c. It co...
High-resolution 25MgNMR data are reported for a single crystal of pure forsterite (Mg2Si04) at temperatures to about 1400°C, which allow rates of exchange ofMgcations among specific sites in the struc...
High-pressure and high-temperature Raman spectra ofilmenite-type MgSi03have been collected up to 7 GPa and 1030 K,respectively. The observed Raman frequency shifts withpressure and temperature wereuse...
The CaGeOJ and SrGeOJ perovskites and CaGeOJ, SrGeOJ, and MnGeOJ pyroxenoids have been studied at high-temperature byX-ray diffraction (XRD) and X-ray absorption fine-structure spectroscopy (XAFS). Th...
Energy-dispersive X-ray powder diffraction spectra have been collected for aragonite (CaCOr) and dolomite [CaMg(COr)r] at high pressure and high temperature, using synchro-tron radiation and a cub...
Adiversity of twinning and exsolution textures has been observed by transmission electron microscopy in natural kalsilite from volcanic and metamorphic rocks (Mount Nyiragongo, Zaire; Alban Hills, Ita...

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