Fig. 2 in Nanostructure of biogenic versus abiogenic calcium carbonate crystals

Fig. 2. Scleractinian Favia stelligera (Dana, 1846), Recent, Lizard Island (Great Barrier Reef, Pacific Ocean), depth 5–10 m; ZPAL V.31/1 (fragment of colony collected by Ann Budd). Polished and etched (formic acid, 1%, 20s) septum with aragonite fibers in two (A, B) enlargements; note negative relief of etched organic components in dRAF zone (upper A) and between fiber's layers. AFM (contact mode; buffered pH = 8, ammonium persulfate 1%, 10 min.): height−2D projection (C, E), and deflection (D, F) images of 2×2 µm (C, D) and 500×500 nm (E, F) skeletal surface. Nanograins ca. 50–100 nm in diameter. Grayscale bars (left) show z−scale (height) of 2D projection images.