“…This magnesium hydroxide silicate exhibits a scroll-like bilayer consisting of a tetrahedral [SiO 4 ] 4À silicate sheet (T) "spreading" along the surface of mutual contact with a trioctahedral [Mg 3 O 2 (OH) 4 ] 2À brucite-like sheet (O). Chrysotile is a polymorph of serpentine in which the T-O sheet lateral misfit is accommodated, to a degree, by a change in curvature resulting in various curved crystal shapes and sizes (Krinari and Khalitov, 1995;Evans, 2004) such as the curled (often uncapped) cylindrical structures, of which a transverse slice along the nanofibril axis is drawn in Fig. 1a.…”