Figure 4
From: Soft corals form aragonite-precipitated columnar spiculite in mesophotic reefs

Environmental scanning electron microscope micrographs of fractured spiculite-bearing colony of Sinularia vrijmoethi. (a) Spindle-shaped sclerite with surface warts. (b) Fractured spiculite revealing sclerites lithified by fibrous crystallites. (c) Magnified cementing material between spindle-shaped sclerites. (d) Fibrous crystallites with euhedral crystal morphology.