ИСТИНА

Diamonds and accompanying minerals from the Arkhangelsk kimberlites and different placers (Ural, Timan, North Yakutiya, Sierra-Leone, Chikapa) were investigated. Morphology, physical properties, and interior structure of the diamonds have been examined by different methods: SEM, IR-spectroscopy, X-ray tomography, Raman-spectroscopy, cathodoluminesence. Chemical composition of the accompanying minerals has been examined with EDS and WDS- micro-beam spectroscopy. It was established, that diamonds in all objects have a specific peculiarities. Comparison with experimental data [Hohkryakov, 2004; Pal’yanov et al., 2002] show, that such morphological peculiarities are form during the solution of the octahedron crystal in carbonate-silicate systems in presence of H20-CH4 fluids with С=О, -ОН, -НОН, СО3, СН2, СН3 groups at T=1300-1450оС and P=0,1-2,5 GPа.