What is silica? What about silicon dioxide?
Silica mineral refers to the same chemical formula (SiO), but there are differences in the structure of minerals, these minerals are called as different as the main body, including quartz, cristobalite and tridymite. These minerals on earth is mainly found in granite, sandstone and black siliceous rocks, while the moon is almost lacking, the main reason is: the evolution of chemical composition, the formation of the moon lunar crust a low silicon, high aluminum, high silicon granitic rocks are extremely rare; the moon in evolution as the lack of ball. There is a crystallization of silica mineral water and hot water system. Although silica minerals are extremely rare on lunar rocks, they play an important role in the classification and genesis of lunar rocks.
Silica widely exists in nature and forms rocks with other minerals. Natural silica, which is about twelve percent of the earth's crust, is composed of two kinds of crystalline and indefinite forms. Quartz crystals are crystalline silica with different crystalline shapes and colors. A colorless crystalline crystalline substance of quartz; usually crystalline. Having a band or layer of colored rings called agate (containing impurities).
The chemical formula of silica 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. Silica is widely used, mainly for the manufacture of glass, water glass, pottery, enamel, refractory materials, aerogels, felt, ferrosilicon, molding sand, silicon, cement and so on. Ordinary stones consist mainly of silica and calcium carbonate.
