More than 90 % clinopyroxenes from Nakyn field kimberlites (Nyurbinskaja, Botuobinskaja and Mayskaja pipes) are omphacites or chrome-omphacites. Only individual clinopyroxenes are chrome-diopcides. It is absolutely not typical for the kimberlites other regions of the World. Mantle substratum of the Nakyn field is substantially formed metamorphysed stratified rocks of basite-ultrabasite complexes with clearly shown attributes of subduction processes. Minerals of the similar stratified complexes formed in core conditions (first of all chrome-omphacites) are not connected with kimberlites and rejected at panned searches in the North the European part of Russia. In the Nakyn field presence in panned samples of similar minerals, on the contrary, can be an attribute of presence of an aureole from the new kimberlite pipes.