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Definitions of silica:
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tridymite-2 coesite stishovite quartz crystallography silica octahedral-coordination perpendicular crystallographic-axis distorted-2 cristobalite-2 deviate trivalent monovalent divalent chalcedony asbestos opal chert sinter facies weaire-phelan-structure tugtupite di-positronium diopside demosponge molecular-sieve |