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Natrolite is not a “soda-stone” anymore: Structural study of alkali (Li+), alkaline-earth (Ca2+, Sr2+, Ba2+) and heavy metal (Cd2+, Pb2+, Ag+) cation-exchanged natrolites

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Published/Copyright: April 2, 2015
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American Mineralogist
From the journal American Mineralogist Volume 96 Issue 11-12

Abstract

We report here the preparation and structural models of alkaline-earth (Ca2+, Sr2+, Ba2+) and heavy metal (Cd2+, Pb2+, Ag+) cation-exchanged natrolites at ambient conditions and compare them to the alkali (Li+, Na+, K+, Rb+, Cs+) cation forms. The latter two groups all crystallize in the orthorhombic Fdd2 symmetry as the natural sodium natrolite, whereas the alkaline earth analogues are all found in the monoclinic Cc symmetry as scolecite, the natural calcium counterpart. We find the existence of a universal linear relationship between the unit-cell volume and the non-framework cation radius in natrolite. The rotation angles of the fibrous chain units are distributed between 25.5° (Li-form) and 2.9° (Cs-form) to show its inverse proportionality to the non-framework cation radius and the channel opening area. We also propose a possible threshold in the cation radius that dictates the distribution pattern of the non-framework cations and water molecules in the ordered and disordered fashions in natrolite.

Keywords : Natrolite; ion exchange; crystal chemistry; Rietveld refinement
Received: 2011-4-4
Accepted: 2011-6-29
Published Online: 2015-4-2
Published in Print: 2011-11-1

© 2015 by Walter de Gruyter Berlin/Boston

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  18. In situ ion-microprobe determination of trace element partition coefficients for hornblende, plagioclase, orthopyroxene, and apatite in equilibrium with natural rhyolitic glass, Little Glass Mountain Rhyolite, California
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https://doi.org/10.2138/am.2011.3853
Keywords for this article
Natrolite; ion exchange; crystal chemistry; Rietveld refinement

Articles in the same Issue

  1. In situ stress-strain measurements in a deformation-DIA apparatus at P-T conditions of the upper part of the mantle transition zone
  2. Element diffusion rates in lunar granulitic breccias: Evidence for contact metamorphism on the Moon
  3. The crystal structure of franckeite, Pb21.7Sn9.3Fe4.0Sb8.1S56.9
  4. Ammonium vermiculite in schists from the Betic Cordillera (Spain)
  5. Natrolite is not a “soda-stone” anymore: Structural study of alkali (Li+), alkaline-earth (Ca2+, Sr2+, Ba2+) and heavy metal (Cd2+, Pb2+, Ag+) cation-exchanged natrolites
  6. Analysis of hydrogen in olivine by SIMS: Evaluation of standards and protocol
  7. New accurate elastic parameters for the forsterite-fayalite solid solution
  8. In-situ mid/far micro-FTIR spectroscopy to trace pressure-induced phase transitions in strontium feldspar and wadsleyite
  9. Structural study of the coherent dehydration of wadsleyite
  10. An atomic force microscopy study of diamond dissolution features: The effect of H2O and CO2 in the fluid on diamond morphology
  11. Unraveling the stacking structure in tubular halloysite using a new TEM with computer-assisted minimal-dose system
  12. High-pressure structural behavior of α-Fe2O3 studied by single-crystal X-ray diffraction and synchrotron radiation up to 25 GPa
  13. The IR vibrational properties of six members of the garnet family: A quantum mechanical ab initio study
  14. On the presence of OH defects in the zircon-type phosphate mineral xenotime, (Y,REE)PO4
  15. Cesium and strontium incorporation into zeolite-type phases during homogeneous nucleation from caustic solutions
  16. Electrical conductivity of albite at high temperatures and high pressures
  17. Crystal-chemical and structural characterization of fluorapatites in ejecta from Somma-Vesuvius volcanic complex
  18. In situ ion-microprobe determination of trace element partition coefficients for hornblende, plagioclase, orthopyroxene, and apatite in equilibrium with natural rhyolitic glass, Little Glass Mountain Rhyolite, California
  19. In situ FTIR investigations at varying temperatures on hydrous components in rutile
  20. Methods to analyze metastable and microparticulate hydrated and hydrous iron sulfate minerals
  21. Crystal chemistry of Ti-rich ferriallanite-(Ce) from Cape Ashizuri, Shikoku Island, Japan
  22. Replacement of pyrrhotite by pyrite and marcasite under hydrothermal conditions up to 220 °C: An experimental study of reaction textures and mechanisms
  23. Argandite, Mn7(VO4)2(OH)8, the V analogue of allactite from the metamorphosed Mn ores at Pipji, Turtmann Valley, Switzerland
  24. Murchisite, Cr5S6, a new mineral from the Murchison meteorite
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