MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Quartz. View of crystals of quartz showing a variety of prisms and pyramidal ends. Quartz is a form of silica (silicon dioxide). It occurs naturally all over the world as sand, and in rocks and mineral veins. Pure quartz is colourless, and its most familiar form is sand. Quartz has many desirable properties and consequently has many applications. These include glass, porcelain, electronics, clocks and watches.
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