The most common morphology is the elongated sword-like [10]
(Fig. 3a); other crystal exhibit an hexagonal squat shape (Fig. 3d).
The observation of ‘‘free’’ single crystals of COT is quite difficult
due to the presence of COD and COM on its surface or leaned to
COT (Fig. 3c). The crystals are subjected to high decay under the
electron beam: after a few minutes, detachments and fractures
are visible (Fig. 3b), confirming the high instability of this crys