Mineralogy of magmaclasts and interclast matrices of kimberley-type pyroclastic kimberlites from the Kao, Letseng-la-Terae, Lethlakane and Premier kimberlite pipes in southern Africa - Mitchell, R.H.; Scott Smith, B.H.; Skinner, E.M.W. (International Kimberlite Conference: Extended Abstracts, 2012)