Gelatinous Siphon Sheath Templates the Starfruit-Shaped Aragonite Aggregate Growth

Figure 6

(a) TEM image of a spindle-shaped aragonite aggregate. (b) HRTEM image of the black circular area in (a), where the nanocrystals are numbered and outlined with dashed lines. In zone II, two sets of lattice fringes were shown, and lattice fringes extend across two adjacent nanocrystals. (c, d) Fast Fourier transform (FFT) patterns of related areas in (b). The former shows a diffuse halo, indicating that the internanocrystal space is filled with amorphous material, while the latter shows clear spots, representing a crystalline texture.