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Abstract
A thin porphyritic dyke, cream-brown in colour, is intruded into Upper Dwyka shales near the kimberlite pipe on Mukorob, South West Africa. Now highly calcitized, the rock was probably an olivine melilitite when fresh. Black ellipsoidal ilmenite-covered altered olivine inclusions give the rock its curious appearance. Other inclusions of rounded replaced olivine and rock types commonly found as cognate xenoliths in kimberlite are scattered throughout the dyke rock.
Although the rock is intensely calcitized, it has been possible from the investigation to offer some suggestions concerning the close petrogenetic association of kimberlite and olivine melilitite.