zhpsЖурнал прикладной спектроскопииZhurnal Prikladnoii Spektroskopii0514-7506B. I. Stepanov Institute of Physics of the National Academy of Scienceszhps-1972Research ArticleАННОТАЦИИ АНГЛОЯЗЫЧНЫХ СТАТЕЙABSTRACTS ENGLISH-LANGUAGE ARTICLESСпектроскопический и элементный сравнительный анализ пурпурно-красных и розовых шпинелей из Мьянмы, Индии, Махенге и Тундуру (Танзания)Spectroscopic and Elemental Analyses of Purplish Red to Pink Spinels from Myanmar, India, Mahenge, and Tunduru (Tanzania)ThongnopkunP.ThongnopkunP.

Чонбури

Chonburi

pimthong@go.buu.ac.thPhlayrahanА.PhlayrahanA.

Чантабури

Chanthaburi Campus, Chanthaburi

Университет БурапхаFaculty of Science, Burapha UniversityУниверситет БурафаFaculty of Gems, Burapha University202526092025925695695Copyright © Thongnopkun P., Phlayrahan А., 20252025Thongnopkun P., Phlayrahan А.Thongnopkun P., Phlayrahan A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://zhps.ejournal.by/jour/article/view/1972

Образцы шпинели пурпурно-красного или розового цвета из Мьянмы, Индии и Танзании (рудники Махенге и Тундуру) проанализированы с использованием геммологических инструментов, ИК-Фурьеспектроскопии нарушенного полного внутреннего отражения (ИК-Фурье-НПВО), спектроскопии комбинационного рассеяния света (КР), синхротронной рентгеновской абсорбционной спектроскопии и электронно-зондового микроанализатора. В то время как геммологические свойства образцов существенно не различались, анализ химического состава с помощью электронно-зондового микроанализатора выявил отличительные характеристики для определения источника. Индийские розовые шпинели содержали относительно высокие концентрации марганца, а конкретные соотношения Cr2O3/Fe2O3 и ZnO/V2O5 характерны для различных источников. Спектры ИК-Фурье-НПВО одинаковые для разных источников, тогда как КР-спектры выявили вариации в соотношениях пиков связей Mg–O и Al–O. Анализ методом рентгеновской абсорбционной спектроскопии подтвердил наличие Cr3⁺ во всех образцах с различной степенью ионизации Fe2⁺ и Fe3⁺. 

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.

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The authors declare that there are no conflicts of interest present.