silica
Silica 
Silicon dioxide, SiO2, the composition of the most common mineral group, of which the most familiar form is quartz. Other silica forms are chalcedony, chert, opal, tridymite, and cristobalite.
Common sand consists largely of silica in the form of quartz.
Common sand consists largely of silica in the form of quartz.
© RM 2009. Helicon Publishing is division of RM.
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