Spectroscopic peculiarities of diamonds from the M.V. Lomonosov deposit

Vasilev E. A., Kriulina G. Yu., Garanin V. K.

Zapiski RMO (Proceedings of the Russian Mineralogical Society). 2020. V. 149. N 2. P. 1-11

https://doi.org/10.31857/S0869605520020082

Language: Russian

Abstract

Diamond crystals from the M.V.Lomonosov deposit (Archangelsk region, Russia) have been studied by methods of luminescence and infrared spectroscopy. There were distinguished three groups of crystals according to their morphology, thermal history and photoluminescence. The first group consists of octahedrons with weak signs of resorption; they have the highest modeled temperature among studied crystals. The second group consists mostly of resorbed dodecahedrons with a middle modeled temperature. The third group crystals are cuboids with the lowest modeled temperature. Those groups correspond to different growth conditions and have signs of different post-growth history. Thus, obtained results indicate the polygenetic origin of diamonds in the Lomonosov deposit. For instance, the diversity of yellow cuboids is shown by their spectroscopic features. There were detected also new photoluminescence systems among the low-temperature cuboid crystals.

Keywords: diamond, photoluminescence, nitrogen, FTIR (infrared spectroscopy)