... oceanic sediments, showed hydrous aluminosilicate minerals like phase π [Al 2 Si 2 O 7 (OH) 3 ] and topaz-OH can retain water up to ~8 GPa ( Wunder et al. 1993a , 1993b ; Schreyer 1995 ). Later, high-pressure experiments on synthetic oceanic sediment revealed that topaz-OH is stable at pressures from 8...

...Mainak Mookherjee; Wendy R. Panero; Bernd Wunder; Sandro Jahn Abstract Phase egg, [AlSiO 3 (OH)], is an aluminosilicate hydrous mineral that is thermodynamically stable in lithological compositions represented by Al 2 O 3 -SiO 2 -H 2 O (ASH) ternary, i.e., a simplified ternary for the mineralogy...

...Earl F. O'Bannon, III; Quentin Williams Abstract Topaz [Al 2 SiO 4 (F,OH) 2 ] is a subduction-related mineral that is found in metasediments and has a large pressure and temperature stability field. Here, we use luminescence spectroscopy of Cr 3+ to probe the Al site in topaz at pressures up to ~60...

... Brucite Mg(OH) 2 58.327 P 3̅ m 1 3.142 3.142 4.766 90 90 120 1 24.54 2.377 Zigan and Rothbauer (1967) Serpentine Mg 3 Si 2 O 5 (OH) 4 277.137 P 31 m 5.332 5.332 7.223 90 90 120 1 107.24 2.584 Mellini (1982) Talc Mg 3 Si 4 O 10 (OH) 2 379.294 C 1̅ 5.290...

... AlSi 3 OH = δ-AlOOH + SiO 2 (stishovite) and the evolution in the elastic moduli and sound velocities of hydrous minerals as a function of density. * E-mail: afu@jsg.utexas.edu Copyright © 2022 by the Mineralogical Society of America 2022 Mineralogical Society of America * E-mail: msong...

... in the Al 2 O 3 -SiO 2 -H 2 O system. They designated this pure hydroxyl end-member as “topaz-OH” (synthetic OH analogue of topaz, hereafter referred to as topaz-OH without the quotation marks). Northrup et al. (1994) determined the structure of topaz-OH from single-crystal X-ray diffraction data...

...); Cpv: Ca-perovskite. Hydrous phases present in pelagic sediments can be estimated based on phase relations in the Al 2 O 3 -SiO 2 -H 2 O system. Diaspore (AlOOH) and phase Π [Al 3 Si 2 O 7 (OH) 3 ] are stable to pressures of 6 GPa, and these phases react with SiO 2 to form hydrous topaz [Al 2...

... 1992, Pawley and Wood 1995 , Mysen et al. 1998, Ono 1999 , Forneris and Holloway 2003 ). Name Symbols Formula wt% H 2 O (Amphibole groups)     Tremolite Trm Ca 2 Mg 5 Si 8 O 22 (OH) 2 2.2     Pargasite Par Na 2 Ca 3 Mg 8 FeAl 3 Si 13 O 44 (OH) 4 2.2...

...*}&&2\ talc\ (Mg_{3}Si_{4}O_{10}(OH)_{2})\ +\ chlorite\ (Mg_{5}Al_{2}Si_{3}O_{10}(OH)_{8})\\&&+4\ Mg-chloritoid\ (MgAl_{2}SiO_{5}(OH)_{2})\\&&=\ 5\ pyrope\ +\ 10\ H_{2}O\end{eqnarray*} \end{document} Schreyer (1968) studied, in the system MgO–Al 2 O 3 –SiO 2 –H 2 O (MASH) (Fig. 1...

... several species, against which we checked the calibrated model for the fully oxidized Al and Si parameters. Some species were expected to give good results: Al(OH) 3 (bayerite), AlOOH (boehmite), Al 4 Si 4 O 10 (OH) 8 (kaolinite), and SiO 2 (tridymite, moganite, and seifertite). However, we had...

... )O 22 (OH) 2 ] and tremolite are both calcic amphiboles. Upon compression, we noted that both α LDA and α GGA decreases (Supplemental 1 Table S4). Figure 3. ( a ) Thermal expansion coefficient (α) of tremolite as a function of temperature at zero-pressure. The filled blue circle refers...

... ) Physical and chemical properties of the epidote minerals–an introduction . Rev Mineral Geochem 56 : 1 – 82 Franz G , Selverstone J ( 1992 ) An empirical phase diagram for the clinozoisite-zoisite transformation in the system Ca 2 Al 3 Si 3 O 12 (OH)-Ca 2 Al 2 Fe 3+ Si 3 O 12...