The fibrous structure generated by the curling of layer structure is one of the three main types of the formation of natural mineral fiber structures. As described in this book (see chapter “Crystal Structure Types and Properties of Minerals”), in the layer structure, the strongest bonds are distributed in two-dimensional space. Atoms or coordination polyhedra are connected into planar networks, with interlayer connections formed by molecular or other weak bonds. Due to the constraints of the layer structure, the crystalline habits of minerals typically manifest as two-dimensional sheet or layer forms. However, when the size of the sheet layers in the layer structure does not match or there is stress between the layers, curling occurs due to mismatch effects or stress, forming a one-dimensional extended fibrous structure.