DOI: 10.1039/d6ra04575h ISSN: 2046-2069
Non-destructive spectroscopic evaluation of Al substitution and its role in the pink colouration of sugilite aggregates
Pengyu Li, Minghong Shi, Ye Yuan, Mudan Xu, Jiayang Han, Meilin Zhu, Jie Hu, Ying GuoNon-destructive spectroscopy combined with colourimetry reveals that Al 3+ substitution for Fe 3+ /Mn 3+ at the octahedral A site contracts the local structure, modifies the Mn 3+ crystal field, blue-shifts the 560 nm band, and drives sugilite from purple to pink.