What are the characteristics of silicon dioxide?
Crystalline silica is divided into three kinds: quartz, scale quartz and square quartz because of their different crystal structures. Pure quartz is a colorless crystal, large and transparent, prism like quartz called crystal. If they contain trace impurities in crystal with different colors, amethyst, Citrine, topaz etc.. Ordinary sand is quartz fine sand, a (iron impurity) and white sand (less impurities, Jiao Chunjing). Silica crystal, silicon atoms with 4 valence electrons and 4 oxygen atoms form 4 covalent bonds, silicon atoms in the tetrahedral centers, 4 vertices of 4 oxygen atoms in the tetrahedron, the crystal is a giant molecule, SiO2 is simplest composed of a single silica molecular, is only expressed the number of atoms of silicon and oxygen ratio of the silica crystals. In SiO2, the bond of Si - O bond is very high, the melting point and boiling point are higher (melting point 1723, boiling point 2230 Celsius).
Silica dioxide, also known as silica, chemical formula SIO2. There are two kinds of crystalline silica and amorphous silica in nature.
Natural earth diatomite is amorphous silica, is the remains of low water plants diatom, white solid or powder, porous, light and soft solid, strong adsorption
