Dislocation-twin interactions were identified, by transmission electron microscopy, in monazite (monoclinic LaPO4) that was spherically indented at room temperature. Emissary dislocations in front of twin tips were observed. Propagation of dislocation slip bands through twins was also observed. Where possible, slip systems were identified.

Twin-Dislocation Interaction in Monazite (Monoclinic LaPO4). R.S.Hay: Philosophical Magazine, 2005, 85[2-3], 373-86