E.R.DEGGINGER / SCIENCE PHOTO LIBRARY E.R.DEGGINGER / SCIENCE PHOTO LIBRARY
Quartz. View of crystals of quartz, a natural form of silica (silicon dioxide, SiO2). It occurs naturally all over the world 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. This specimen is from Minas Gerais, Brazil.
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