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Çó·ÒëÈçÏÂÎÄÕ£ºThe building block of silica and the silicate structures is the S1O4 tetrahedron, four oxygen atoms at the corners of a regular tetrahedron with a silicon ion at the center cavity or centroid (Figure 1). The oxygen ion is so much larger than the S i 4 + ion that the four oxygens of a S1O4 unit are in mutual contact and the silicon ion is said to be in a tetrahedral hole (I). Natural silicas can be crystalline, as in quartz, cristobalite, tridymite, coesite, and stishovite, or amorphous, as in opal. Crystalline silica polymorphs are divided according to their framework density (SiO2 groups per 1000 ¨¤3 ) into pyknosils and porosils, and the latter are further divided into clathrasils and zeosils depending on whether the pores are closed or open, that is, accessible to adsorption . |
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