Spectral analysis at the infrared (IR) spectral range is introduced with assignment of synthetic red-green-blue (RGB) colours defined by adjustable wavelength and bandwidth. The RGB bands were selected at the phase-specific absorbance A or reflectance R bands of olivine and related materials, which can be formed via high temperature annealing (HTA) of natural minerals up to 1500 C. Natural olivines were collected from quarry at volcanic site in Mortlake, Victoria, Australia and spectrally characterised during IR-THz spectroscopy beamtime experiments at Australian Synchrotron. Phase changes in HTA natural olivines were traced by correlation of optical IR 4-polarisation spectroscopy, X-ray energy dispersive spectroscopy and magnetisation. After HTA, olivine samples were magnetized via precipitation of Fe-rich oxides.
@article{arxiv.2604.07356,
title = {Olivine annealed up to 1500 C: changes traced by polarised IR reflectance and magnetization},
author = {Daniel Smith and Donatas Narbutis and Hsin-Hui Huang and Philipp Zanon and Michael Boschen and Jitraporn Vongsvivut and Dominique Appadoo and Soon Hock Ng and Haoran Mu and Tomas Katkus and Nguyen Hoai An Le and Dan Kapsaskis and Andy I. R. Herries and Vijayakumar Anand and Meguya Ryu and Junko Morikawa and Saulius Juodkazis},
journal= {arXiv preprint arXiv:2604.07356},
year = {2026}
}