This study is focused on the vibrational and microstructural aspects of the thermally induced transformation of serpentine-like garnierite into quartz, forsterite, and enstatite occurring at about 620 °C. Powder specimens of garnierite were annealed in static air between room temperature and 1000 °C. The kinetic of the transformation was investigated by means of thermogravimetric and differential thermal analysis, and the final product was extensively characterized via micro-Raman spectroscopy and X-ray diffraction. Our study shows that serpentine-like garnierite consists of a mixture of different mineral species. Furthermore, these garnierites and their composition can provide details based on the mineralogy and the crystalline phases resulting from the thermal treatment.
A. Kumar, M. Cassetta, M. Giarola, M. Zanatta, M.L. Guen, G.D. Sorarù, G. Mariotto, Thermal annealing and phase transformation of serpentine-like garnierite, Minerals 11, 188 (2021), https://doi.org/10.3390/min11020188.