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<p>Purplish red to pink spinel samples from Myanmar, India, and Tanzania (Mahenge and Tunduru mines) were analyzed using gemological tools, attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy, Raman spectroscopy, synchrotron X-ray absorption spectroscopy, and electron probe microanalyzer (EPMA). While gemological properties did not significantly differ across samples, chemical composition analysis by EPMA revealed distinct characteristics for source determination. Indian pink spinels contained relatively high manganese concentrations, and specific Cr<sub>2</sub>O<sub>3</sub>/Fe<sub>2</sub>O<sub>3</sub> and ZnO/V<sub>2</sub>O<sub>5</sub> ratios were characteristic of different sources. The ATR-FTIR spectra were consistent across sources, whereas the Raman spectra revealed variations in the Mg–O and Al–O bond peak ratios. X-ray absorption spectroscopy analysis confirmed the presence of Cr<sup>3+</sup> in all the samples, with varying Fe<sup>2+</sup> and Fe<sup>3+</sup> states. By comparing spinels from Myanmar, India, and Tanzania, this comprehensive study enhances the understanding of regional variations in spinel characteristics, contributing to more accurate origin determination and market classification.</p>

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Spectroscopic and Elemental Analyses of Purplish Red to Pink Spinels from Myanmar, India, Mahenge, and Tunduru (Tanzania)

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • P. Thongnopkun,
  • A. Phlayrahan

摘要

Purplish red to pink spinel samples from Myanmar, India, and Tanzania (Mahenge and Tunduru mines) were analyzed using gemological tools, attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy, Raman spectroscopy, synchrotron X-ray absorption spectroscopy, and electron probe microanalyzer (EPMA). While gemological properties did not significantly differ across samples, chemical composition analysis by EPMA revealed distinct characteristics for source determination. Indian pink spinels contained relatively high manganese concentrations, and specific Cr2O3/Fe2O3 and ZnO/V2O5 ratios were characteristic of different sources. The ATR-FTIR spectra were consistent across sources, whereas the Raman spectra revealed variations in the Mg–O and Al–O bond peak ratios. X-ray absorption spectroscopy analysis confirmed the presence of Cr3+ in all the samples, with varying Fe2+ and Fe3+ states. By comparing spinels from Myanmar, India, and Tanzania, this comprehensive study enhances the understanding of regional variations in spinel characteristics, contributing to more accurate origin determination and market classification.