Quartz crystals on a reflective surface. This group, from the Ouachita Mountains, Arkansas, USA, is comprised of particularly clear quartz crystals. Quartz is a form of silica (silicon dioxide, SiO2) and is one of the most abundant minerals in the Earth's continental crust. It is used in optical and scientific instruments, and in electronics, such as quartz watches. The actual width of this group is 160 millimetres.
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