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The physical properties of silica

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The physical properties of silica

Post  gill on Wed Dec 22, 2010 10:48 pm

Silica, also known as silica, chemical formula SiO2, is inorganic chemistry. The presence of crystalline silica in nature and two amorphous silicon dioxide.The crystal structure of different crystalline silica, is divided into quartz, tridymite and cristobalite three. Pure quartz is colorless crystals, large and transparent prismatic crystal of quartz is called. If the crystal containing traces of impurities with different colors, amethyst, citrine, smoky quartz and so on. Crystalline silica, the silicon atoms of the four valence electrons and four oxygen atoms form four covalent bonds, silicon atoms in the center of a regular tetrahedron, four oxygen atoms in the tetrahedron of four vertices, the whole Crystal is a giant molecule, SiO2 is the most simplified form that does not mean that a single molecule of silica, crystalline silica is only expressed in the number of atoms of silicon and oxygen ratio.


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