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- W3111790546 abstract "ABSTRACT Beryl and phenakite are important industrial beryllium minerals. In the hydrous melt of the BeO–Al2O3–SiO2–H2O (BASH) system, experiments using quench-type high-temperature and high-pressure equipment have revealed that the different activities of Al2O3 and SiO2 (αAl2O3 and αSiO2) are the main factors that lead to different beryllium mineral assemblages. In this study, we attempted in situ observation of the crystallization process of phenakite and beryl in an aqueous solution of the BASH system using a hydrothermal diamond-anvil cell. Experimental results indicate that phenakite and beryl can crystallize faster in this regime (i.e., 2.93–0.58 × 10−5 cm/s in length and 22.39–3.23 μm3/s in volume) than from a hydrous melt. In addition, in the phenakite and beryl crystallization, pressure–temperature conditions were greater than 467 °C and 220 MPa and 495 °C and 221 MPa, respectively, and their upper temperatures and pressures attained 845–870 °C and 500–1300 MPa. These features indicate that temperature is not the main factor that controls the stability of phenakite and beryl in the BASH system. This stability can be attributed to the diffusion of components in aqueous solution that change αSiO2 and αAl2O3 during the heating and cooling processes. During heating, αSiO2 increases while beryl is dissolving, which leads to phenakite crystallization; during cooling, αSiO2 and αAl2O3 are sufficient for the remaining beryl to recrystallize. Therefore, the transition between phenakite and beryl in the aqueous solution in the BASH system may be different during heating and cooling processes. This reasoning can explain the abundance of phenakite in miarolitic cavities and the occurrence of phenakite, rather than beryl, in hydrothermally altered pegmatites, volcanic rocks, and other beryllium-rich rocks." @default.
- W3111790546 created "2020-12-21" @default.
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- W3111790546 date "2020-11-01" @default.
- W3111790546 modified "2023-10-02" @default.
- W3111790546 title "<i>In situ</i> observations of the transition between beryl and phenakite in aqueous solutions using a hydrothermal diamond-anvil cell" @default.
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- W3111790546 doi "https://doi.org/10.3749/canmin.1900104" @default.
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