Lac Nègre

When you reach Lac Nègre, you will see on its right bank, several metres below the lake’s spillway, a granite outcrop which is notable for the presence of several vertical lines which split the granite into fairly regular lozenge shapes.This corresponds to a transformation of the granite. There is a very particular structure with the apparition of cleavage and a big reduction in the size of the minerals. This phenomenon, characteristic of deformed rocks, is known as mylonite.