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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Cited articles

Alberti, A.: Sodium-rich dachiardite from Alpe di Siusi, Italy, Contrib. Mineral. Petrol., 49, 63–66, 1975. 
Alberti, A. and Vezzalini, G.: The crystal structure of amicite, a zeolite, Acta Crystallogr. B, 35, 2866–2869, 1979. 
Alberti, A., Hentschel, G., and Vezzalini, G.: Amicite, a new natural zeolite, Neues Jb. Miner. Monat., 481–488, 1979. 
Alietti, A. and Passagli, E.: A new occurrence of ferrierite, Am. Mineral., 52, 1562–1563, 1967. 
Anderson, O. L.: Optical properties of rock-forming minerals derived from atomic properties, Fortschr. Mineral., 52, 611–629, 1975. 
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.