Abstract
The water content of nephelines from volcanic, subvolcanic and metamorphic parageneses of Somma-Vesuvio, Italy was studied by polarized FTIR microspectrometry on oriented (0001) crystal plates. The H(in2)O content varies from 0.05 to 0.39 wt% and is mainly controlled by the number of vacancies in the alkali site. Most samples show an inhomogeneous distribution of the H2O molecules, oriented with their H-H-axis perpendicular to [0001]. The absorption behaviour in the region of the OH-stretching fundamentals is characterized by four spectra types. The “high temperature spectrum” of a thermally treated nepheline reported by Beran and Rossman (1989) also occurs in some natural samples from the metamorphic paragenesis of Somma-Vesuvio.
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