Figure 3. Electron micrographs of oriented sections of precipitated calcite crystals.

(a) Scanning electron microscope image of the sample crystal, where the dotted blue line shows the direction of the cut. Scale bar, 1 μm. (b) The selectively thinned tip of the prepared lamella, whose location with respect to the original crystal is indicated in the yellow box shown in a. (c) Shows a higher-magnification image of the front end of the tip (arrowed in b). Arrowed in c is a feature of size ∼85 × 15 nm, which corresponds to the ‘surface cusps' imaged using BCDI. Scale bar, 100 nm.