Structuration under pressure: Spatial separation of inserted water during pressure-induced hydration in mesolite

Yonghwi Kim, Jinhyuk Choi, Thomas Vogt, Yongjae Lee

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6 Citations (Scopus)

Abstract

In situ high-pressure single-crystal X-ray diffraction studies of mesolite, an aluminosilicate composed of stacks of Na+ -containing natrolite and Ca2+-containing scolecite layers in the ratio of 1:2, showed two discrete steps of pressure-induced hydration (PIH): first H2O molecules are inserted into the natrolite layers between ∼0.5 and ∼1.5 GPa and subsequently into the scolecite layers. During the PIH in the natrolite layers, the coordination environment of Na+ changes from six to seven, the same as that of Ca2+ in the scolecite layers. While the natrolite layers behave as in the mineral natrolite, the scolecite layers show a different behavior from the mineral scolecite by adopting the super-hydrated natrolite-type structure at higher pressure, as a larger distortion is not favorable in the 1:2 layered framework. This spatial separation of inserted H2O during PIH and the growing structural similarity of the two layers result in a weakening of k 3n reflections maintaining the 1:2 layer configuration. Our study of this unique behavior of mesolite provides a simple model of structuration under pressure, and the implications of our experimental findings are discussed.

Original languageEnglish
Pages (from-to)175-178
Number of pages4
JournalAmerican Mineralogist
Volume103
Issue number1
DOIs
Publication statusPublished - 2018 Jan 26

Bibliographical note

Funding Information:
This work was supported by the Global Research Laboratory (NRF-2009-00408) and National Research Laboratory (NRF-2015R1A2A1A01007227) programs of the Korean Ministry of Science, ICT, and Planning (MSIP). We also thank the supports by NRF-2016K1A4A3914691 and NRF-2016K1A3A7A09005244 grants. The experiments for this work were supported by the Seoul Western Center of Korea Basic Science Institute (KBSI) at Ewha Women's University in Korea. We thank H. Lee at KBSI for instrumental support

Funding Information:
This work was supported by the Global Research Laboratory (NRF-2009-00408) and National Research Laboratory (NRF-2015R1A2A1A01007227) programs of the Korean Ministry of Science, ICT, and Planning (MSIP). We also thank the supports by NRF-2016K1A4A3914691 and NRF-2016K1A3A7A09005244 grants. The experiments for this work were supported by the Seoul Western Center of Korea Basic Science Institute (KBSI) at Ewha Women’s University in Korea. We thank H. Lee at KBSI for instrumental support.

Publisher Copyright:
© 2018 Walter de Gruyter GmbH, Berlin/Boston.

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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