The presence of silica is crystalline and amorphous. Quartz crystal is crystalline silica, silicon dioxide crystals and oxygen atoms in the atomic ratio of 1: 2 atomic composition of the three-dimensional network of crystals, with different crystal and color.
Amorphous refers to the structure of some non-complete crystalline amorphous areas (amorphous regions) or some amorphous solid (amorphous) composition. Many of the substances that can constitute crystals are amorphous, and the reactivity is generally greater than that of the same material.
Amorphous silicon, also known as amorphous silicon, is a kind of silicon allotropes. Crystalline silicon is usually tetrahedron, and each silicon atom is at the apex of the tetrahedron and is covalently bonded to the other four silicon atoms. This structure can be stretched very large, thus forming a stable lattice structure. And no qualitative silicon does not exist in this extended lattice structure, the lattice network between atoms was disordered.