In the Tebinbulak intrusion composed of ultrabasic and basic, in some places with alkaline gradient composition rocks found amphibole rocks probably of metasomatic origin and belonging to thweitazite, characteristic for felitized hybrid rocks. They resulted from the interaction of the main basaltoid magma of the studied intrusion with the intervening Middle Paleozoic acidic sequence. The rocks may also indicate a connection with them of iron-ore, chromite, platinoid, and rare-metal mineralization.