<prompt> Renal stones which are laminated and irregular in outline areUric acidCalcium oxalateStruviteCystine  <response>: Calcium oxalate stones are laminated and irregular in shape and covered with sharp projections which cause bleeding. The surface of these stones are thus discoloured by altered blood- brown in colour- mulberry stones Reference : page 1296 Bailey and Loves sho practice of surgery 25th edition 