Purple-Violet Gem Spinel from Tanzania and Myanmar: Inclusion, Spectroscopy, Chemistry, and Color

Purple-violet gem spinels from Tanzania and Myanmar have been investigated for their gemological, spectroscopic, chemical, colorimetric characteristics. Samples TS MS both had a purple hue with pinkish or brownish secondary tone medium–strong saturation. We identified number of inclusions, including dolomite, phlogopite, forsterite in Tanzanian spinel magnesite, apatite, baddeleyite, anhydrite, pyroxene, graphite spinel. slightly lower FWHM (full width at half maximum) values the 406 cm−1 line Raman spectrum Cr3+ zero phonon PL compared to samples Myanmar. Fe, Mn, Cr, V, Zn are proved as useful discriminators distinguish these two geographic locations. UV-Vis-NIR spectra CIE L*a*b* parameters trace element chemistry. Both colored by Fe2+, minor Fe3+, Cr3+, V3+. Fe combined influence angle lightless Tanzania. However, due relatively stable content samples, shows effect on parameters. It is worth noting that all inclusion scene, spectral, chemical characteristics, well comparison presented this study limited