High Pressure Raman Study of Laumontite Overhydration in Different Water-Containing Media
https://doi.org/10.25205/2541-9447-2018-13-4-131-137
Abstract
Laumontite overhydration was studied using Raman spectroscopy. Compression in water (up to 9.3 GPa) and in water-alcohol medium (MEW - methanol / ethanol / water 16 / 3 / 1, up to 5.8 GPa) were compared. Sample Ca-Na-K-laumontite from Akhaltsikhe, Georgia was selected. The mineral formula is {Ca2.73Na1.44K1.03(H2O) n } [Al7.93Si16.07O48], where 12< n <18 depending on the humidity and pressure of the medium. By means of Raman spectroscopy, a heterogeneous state of Ca-Na-K-laumontite at P = 0-2.2 GPa in MEW medium was revealed, in contrast to compression in water. An increasing difference between wavenumber/pressure dependencies (2.2-4.5 GPa) related to compression in water and MEW can be ascribed to penetration of additional amount of water in crystal channels during compression in ice VII. A polymorphic transition in laumontite at 4.5-4.8 GPa was also detected. The onset of the disordering laumontite structure was observed at pressure above 8 GPa.
About the Authors
S. V. Goryainov
Sobolev Institute of Geology and Mineralogy SB RAS
Russian Federation
Russian Federation
U. O. Borodina
Sobolev Institute of Geology and Mineralogy SB RAS
Russian Federation
Russian Federation
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Review
For citations:
Goryainov S.V., Borodina U.O. High Pressure Raman Study of Laumontite Overhydration in Different Water-Containing Media. SIBERIAN JOURNAL OF PHYSICS. 2018;13(4):131-137. (In Russ.) https://doi.org/10.25205/2541-9447-2018-13-4-131-137
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