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Silica Structure

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silica Definition Facts Britannica

Silica also called silicon dioxide compound of the two most abundant elements in Earths crust silicon and oxygen SiO 2 The mass of Earths crust is 59 percent silica the main constituent of more than 95 percent of the known rocks Silica has three main crystalline varieties quartz by far the most abundant tridymite and cristobalite


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