What is the silica dioxide left after burning?
Amorphous silica is the natural existence of diatomite and other low water plants, diatom remains of the white solid or powder, porous, light and soft solid, strong adsorption, chemical properties are very stable. Not soluble in water or reacted with water. It is an acid oxide and does not react with ordinary acids.
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..
