Fig. 3.
SEM micrograph of fracture plane near the tip of a mineralized tooth of C. stelleri. The leading surface is shown at the upper half of the picture and the trailing surface is shown at the left hand side. The trailing part is composed of large, elongated crystal units. The internal structure of the leading part is to a large extent obscure. Only close to the leading surface and parallel to that surface can thin crystal units be observed. Untreated material. Bar=5 μm.