Diamonds of the Northwestern part of the Anabar diamondiferous region — Placers of the Khara-Mas River (Yakutia)

As a result of the study of a representative collection of diamonds from the Khara-Mas river placer (Anabar, Yakutia), provided by ALROSA PJSC, using morphological analysis, IR and EPR spectroscopy, crystal distributions by basic typomorphic features such as habitus, coloration, the presence of twins and accretions, morphology of relics of the crystal growth surface, and its processes were established. dissolution, as well as plastic deformation, degree of mechanical wear, etc. The main differences between the diamonds of the Khara-Mas placer and other placers of the Anabar region are the widest possible distribution of spinel twins, as well as the association of paramagnetic centers P1 — P2 — W21. Within the framework of the previously proposed model of genetic groups combining the assumed heterogeneous primary sources of diamond demolition in the Anabara placers, a natural decrease in the proportion of crystals of high transparency, without inclusions, twins and accretions, is shown.