“…66.6% in the Rabat-Salé (Morocco) (Bouatia et al, 2015) and 58.5% in the Middle Atlas (Oussama et al, 2000). Regarding the stone's structure, there two principal types, namely calcium oxalate monohydrate (COM) (Figure 5A), that can be further categorized into five different morphological aspects (subtype types Ia, Ib , Ic, Id and Ie) and characterised by a compact structure, hard and resistant to extracorporeal shock wave lithotripsy (Doré, 2005). While the second type which is calcium oxalate dihydrate or weddellite (COD) (Figure 5B), exhibits 3 subtypes (IIa, IIb, IIc) ( Doré, 2005;Lechevallier et al, 2008;Aguilar-Ruiz et al, 2012;Castiglione et al, 2015;Daudon et al, 2016a).…”