TYPOMORPHIC CHARACTERISTICS OF THE URAL DIAMONDS (from FTIR spectroscopy data)
E.N. Fedorova, A.M. Logvinova, L.I. Luk’yanova, N.V. Sobolev
Keywords: Diamond, FTIR spectroscopy, nitrogen, hydrogen
Abstract
Natural diamonds from the Ural alluvial deposits have been studied by FTIR spectroscopy. It is shown that these diamonds are similar in some typomorphic characteristics, such as nitrogen content and aggregation state, to the diamonds of the Coromandel (Brazil) and Verkhnee Molodo (Lena region, Yakutia) placers and to the diamonds from kimberlites of the Arkhangel’sk Region but differ significantly in lower contents of hydrogen and higher contents of platelets. The high contents of hydrogen (5–20 cm–1) determined in some diamonds due are to the specific formation of their internal structure and to the presence of inclusions. The nonuniform distribution of nitrogen A- and B-centers throughout the crystal testifies to the zonal structure of diamonds. The temperature conditions of the Ural diamonds formation have been estimated.
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