European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 32, issue 1
Articles | Volume 32, issue 1
https://doi.org/10.5194/ejm-32-27-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-32-27-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 32, issue 1
Research article
 | 
15 Jan 2020
Research article |  | 15 Jan 2020

Determination of the H2O content in minerals, especially zeolites, from their refractive indices based on mean electronic polarizabilities of cations

Reinhard X. Fischer, Manfred Burianek, and Robert D. Shannon

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Latest update: 03 Jun 2026
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Short summary
It is shown here that the H2O content of hydrous minerals can be determined from their mean refractive indices with high accuracy. This is especially important when only small single crystals are available. Such small crystals are generally not suitable for thermal analyses or for other reliable methods of measuring the amount of H2O. The results are compared with the observed H2O content evaluating 157 zeolite-type compounds and 770 non-zeolitic hydrous compounds, showing good agreement.
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