Articles | Volume 32, issue 1
Eur. J. Mineral., 32, 27–40, 2020
https://doi.org/10.5194/ejm-32-27-2020
Eur. J. Mineral., 32, 27–40, 2020
https://doi.org/10.5194/ejm-32-27-2020

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 et al.

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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.