Mineralogical Characteristics and Spectroscopy of Yellow-Green Prehnite

Abstract

Abstract: Prehnite can be produced in the form of platy, schistose, botryoidalis, kidney, radial or massive aggregates. In recent years, prehnite has attracted the attention of many scholars due to its beautiful appearance and special crystal structure. In this paper, the composition, structure and spectral characteristics of yellow-green prehnite were investigated by the electron microprobe, powder X-ray diffractometer, fourier transform infrared spectrometer, micro-Raman spectrometer, and ultraviolet-visible spectrophotometer. The main chromogenic element of prehnite is Fe. Fe³⁺ often replaces Al³⁺ to occupy the octahedral coordination position, and Fe²⁺ often replaces Ca²⁺ into the lattice channel. The electron microprobe results show that the content changes of Fe and Al are negatively correlated as a whole, and the content changes of Fe and Ca are also negatively correlated as a whole. The samples with relatively high Fe content have a deeper yellow-green tone. XRD patterns and Raman spectra show that epidote exists in the form of inclusion in prehnite. Infrared and Raman spectra show that there are two framework of silicon-oxygen tetrahedron and aluminum-oxygen octahedron in prehnite. The UV-Vis absorption spectra reveal the chromogenic mechanism of prehnite. This paper systematically analyzes the mineralogical and spectral characteristics of prehnite, so as to provide ideas and experimental data for the further research of prehnite.

Key words: prehnite, mineralogy, composition, structure, spectral characteristic, chromogenic mechanism

CLC Number:

WANG Qianqian, GUO Qingfeng, GE Xiao. Mineralogical Characteristics and Spectroscopy of Yellow-Green Prehnite[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2022, 51(4): 723-729.

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