Brittle competent minerals may undergo rupture and faulting under high strains. Megacrysts of some minerals such as feldspar in mylonites may undergo micro faulting under certain circumstances. In some cases a single grain may be divided into several slices by parallel microfaults. The oblique individual fragments slide past the other and rotate at the same time. With reference to the sense of shearing in the matrix. the sense of slip along the microfaults and the sense of rotation of microfaults may be either antithetic or sympathetic.