Overview about Raman spectroscopy of types of olivine group minerals: A brief review

Abstract

The main idea of this work is to develop a brief synthesized review of the spectra of the members of the olivine group (forsterite, fayalite, Co‐olivine, and Ni‐olivine). In particular, the objective is to descriptively evaluate the different κ1 and κ2 values from the spectral bands of each mineral. The results gathered from the documentary survey of several published articles, it was possible to notice a substantial difference between the κ1 and κ2 values of forsterite and the other members. On the other hand, the difference between the values of κ1 and κ2 among the other members is almost imperceptible (fayalite, Ni‐olivine, and Co‐olivine). Thus, the probable main difference between all fayalite and other members (Co‐ and Ni‐olivine) can be seen in lower wavenumbers between 200 and 300 cm−1. In conclusion, if the objective is just to distinguish olivine, the doublet band is a good parameter to be used, but if you want to detail about which mineral of the olivine group was analyzed, the lower wavenumbers probably are the best choices.

Infrared Spectroscopic Investigations of Calcium Oxalate Monohydrate (Whewellite) Dehydration/Rehydration

“…When positive and negative difference spectrum areas associated with band shifts were comparable, they effectively canceled each other in integrated area calculations, which is why the Figure 3a Infrared spectra acquired by using a step heating program (Figure 6) were used to distinguish between COM and α-COA crystal lattice expansion/contraction and sample dehydration/rehydration. After measuring an infrared spectrum at 30 °C, TLow(1), the sample was quickly heated (2 °C s −1 ) to 40 °C, THigh (1). After equilibrating at 40 °C for 10 s, another spectrum was measured.…”

“…Vibrational spectroscopy has long been used for mineral characterizations [1][2][3][4]. Vibration band frequencies and intensities are determined by the molecular structure and intermolecular interactions [5].…”