What is the hardness of SiO2?
Silica also called silica, chemical formula SiO. There are two kinds of crystalline silica and amorphous silica in nature.The main component of sand is silicaCrystalline 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 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 tetrahedral, SiO is most simple composition, only said the number of atoms of silicon and oxygen silica crystals the ratio of the. Silicon dioxide is an atomic crystal.
Silica is widely used, mainly used in making glass, water glass, pottery, ceramic, refractory material, aerogel blanket, ferrosilicon, silicon sand, cement, etc., in ancient times, silica is used to make the glaze porcelain and carcass. Ordinary stones consist mainly of silica and calcium carbonate.
Silica, chemistry, pure silica is colorless, is solid at normal temperature, chemical formula SiO, insoluble in water. Insoluble in acids but soluble in hydrofluoric acid and hot concentrated phosphoric acid, used in combination with molten bases. There are two kinds of crystalline silica and amorphous silica in nature.
