Abstract
The beryl-group mineral johnkoivulaite, Cs(Be2B)Mg2Si6O18, was compressed hydrostatically in a diamond-anvil cell up to 10.2 GPa. In situ Raman spectroscopy and X-ray crystallography revealed a P6/mcc-to-P3c1 (second-order) phase transition on isothermal compression at the critical transition pressure Pc = 4.13 ± 0.07 GPa. The elastic parameters determined for the volume elasticity of the two polymorphs correspond to a Birch-Murnaghan equation of state with K0 = 148 ± 2 GPa and K ′ = 0 for P < Pc and K0 = 75.5 ± 0.9 GPa with K ′ = 4 for P > Pc. The low-P polymorph shows anomalously linear compression behavior, as reported for several other beryl-derived framework structures. The high-P polymorph, which was found to follow a
Acknowledgments and funding
We are grateful to Andreas Wagner (IfMK, University of Vienna) for all the effort in the sample preparation. G. Bromiley, an anonymous reviewer and the Technical Editor Team are warmly thanked for the revision of the manuscript. We thank University of Vienna for financial support within the scope of the grants BE532003 and IP532022 and the Italian Ministry of Education (MIUR) through the project “PRIN2017—Mineral reactivity, a key to understand large-scale processes” (2017L83S77).
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Articles in the same Issue
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Articles in the same Issue
- The search for a universal law of crystal growth: The law of proportionate effect?
- Crystal growth according to the law of proportionate effect
- Melt-mediated re-equilibration of zircon produced during meltdown of the Chernobyl reactor
- High-pressure behavior and structural transition of beryl-type johnkoivulaite, Cs(Be2B)Mg2Si6O18
- Subsolidus breakdown of armalcolite: Constraints on thermal effects during shock lithification of lunar regolith
- Melting and melt segregation processes controlling granitic melt composition
- Magmatic degassing controlled the metal budget of the Axi epithermal gold deposit, China
- Formation of mixed-layer sulfide-hydroxide minerals from the Tochilinite-Valleriite group during experimental serpentinization of olivine
- Two discrete gold mineralization events recorded by hydrothermal xenotime and monazite, Xiaoqinling gold district, central China
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- Origin of gem-quality turquoise associated with quartz-barite veins in western Hubei Province, China: Constraints from mineralogical, fluid inclusion, and C-O-H isotopic data
- The 450 nm (2.8 eV) cathodoluminescence emission in quartz and its relation to structural defects and Ti contents
- Correlation between Hinckley index and stacking order-disorder in kaolinite
- Structure and titanium distribution of feiite characterized using synchrotron single-crystal X-ray diffraction techniques
- Enrichment of precious metals associated with chalcopyrite inclusions in sphalerite and pyrite
- An UV/Vis/NIR optical absorption spectroscopic and color investigation of transition-metal-doped gahnite (ZnAl2O4 spinel) crystals grown by the flux method
- Understanding the unique geochemical behavior of Sc in the interaction with clay minerals
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