Figure 4. Iso-surface rendering of the defects present within the oriented calcite crystals.

The defects shown have a low electron density core that is surrounded by a spiral deformation field/phase, and correspond to dislocation loops. In both crystals (i and ii) the plane of the loop is directed towards the truncation facet (pink arrow). Defects are given in respect to their location within the crystal, as given by semi-transparent projections of the electron density. Q is the scattering vector. Scale bar, 1.8 μm.