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The Adobe Flash Player is required in order to view this content. You can get it here: silicaMain Entry: sil·i·ca Pronunciation: \ˈsi-li-kə\ Function: noun Etymology: New Latin, from Latin silic-, silex hard stone, flint Date: circa 1801 : the dioxide of silicon SiO2 occurring in crystalline, amorphous, and impure forms (as in quartz, opal, and sand respectively) 
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