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Colorimetry characteristics and color contribution of fluorescence in natural Cr-containing spinel by Jun Tang; Ying Guo; Jun Zhang is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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## Abstract Fluorescence plays an important role in determining the color appearance of fluorescing minerals. This paper discusses the color mechanism in the red spinel and the color effects from the light source as well as the background on the spinel color. Excitation-Emission Matrices (EEMs) fluorescence spectroscopy was utilized to characterize the fluorescence of natural Cr-doped magnesia-alumina spinel from Myanmar. EMP, LA-ICP-MS, and optical spectroscopy were applied to study the spinel's chemical compositions and color mechanism. X-Rite Ci-7800 spectrophotometer, which is useful to measure colors for fluorescing minerals, was employed to acquire color data of spinel in daylight and incandescent light. The results indicated the higher value of Cr/Fe makes pinkish-red spinel has a much stronger red fluorescence effect than dark-red spinel. The two narrow absorption bands at ~ 25,500 cm^−1^ (with a broad absorption band at ~ 24,100 cm^−1^) and ~ 18,570 cm^−1^ in the optical absorption spectrum are assigned to spin-allowed electronic d-d transitions ^4^A~2g~ → ^4^T~1g~(F) and ^4^A~2g~ → ^4^T~2g~(F) in Cr^3+^ at the M site. The EEMs spectra of the pinkish-red spinels show twin

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Author

Jun Tang; Ying Guo; Jun Zhang

Publisher

Springer Science and Business Media LLC

Published

2023

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)