Raman spectroscopic investigations of natural jennite from Maroldsweisach, Bavaria, Germany

A full‐range pattern (100–3700 cm−1) analysis of natural jennite was performed for the first time by Raman spectroscopy, applying a polarized laser at a wavelength of 532 nm. A prominent structural feature of jennite is the preferred orientation of Si‐tetrahedron and Ca‐octahedron chains parallel [010]. The latter ones are additionally coupled to H2O molecules and OH groups. This arrangement leads to a strong dependence on orientation for the intensity ratios of mainly three different regions in the Raman spectra: 180–210, 950–1050 and 3100–3650 cm−1. These sections can be assigned to Ca–O lattice vibrations, Q2 Si–tetrahedron stretching and O–H vibrations of H2O molecules and Ca–OH structures, respectively. Copyright © 2015 John Wiley & Sons, Ltd. A full‐range pattern (100–3700 cm−1) analysis of natural jennite was performed for the first time by Raman spectroscopy. A prominent structural feature of jennite is the preferred orientation of Si‐tetrahedron and Ca‐octahedron chains parallel [010]. The latter ones are additionally coupled to H2O molecules and OH groups. This arrangement leads to a strong dependence on orientation of distinct regions in the Raman spectra, discussed herein.