The Nature of Spinel Coloring from the Goron Deposit in the Southwestern Pamirs

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Abstract

This paper presents results of a study of the color of natural spinel from the Goron deposit. Mössbauer spectroscopy, optical absorption and luminescence spectroscopy were used to identify crystal chemical features of Goron spinel. The distribution of main chromophore centers in studied spinel samples was studied and the nature of color of spinel has been revealed. The main color centers are chromium, iron, and manganese ions which are located in tetrahedral and octahedral coordination polyhedra. Additionally, it was established that the main color is affected by exchange interactions of pairs of Fe3+IV–Fe3+VI ions that interact through a common oxygen ligand. As a result, a complex set of optically active centers was obtained which created a unique color (including the alexandrite effect) in spinel.

About the authors

A. I Bakhtin

Kazan Federal University

Kazan, Russia

A. G Nikolaev

Kazan Federal University

Email: anatolij-nikolaev@yandex.ru
Kazan, Russia

S. A Ananyev

Siberian Federal University

Krasnoyarsk, Russia

F. G Vagizov

Kazan Federal University

Kazan, Russia

L. D Iagudina

Kazan Federal University

Kazan, Russia

E. M Nurieva

Kazan Federal University

Kazan, Russia

References

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