What are the physical properties of silicon dioxide?
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 tetrahedral, many such tetrahedra and vertex connected by oxygen atoms, each oxygen atom into two tetrahedral co that is, each oxygen atom and two silicon atoms combine. SiO is most simple composition, only said the number of atoms of silicon and oxygen ratio of the silica crystals. Silicon dioxide is an atomic crystal.
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 also called silica, chemical formula SiO. There are two kinds of crystalline silica and amorphous silica in nature. Crystalline silica is divided into three kinds: quartz, scale quartz and square quartz because of their different crystal structures.
