ROBERTO DE GULIEMO / SCIENCE PHOTO LIBRARY ROBERTO DE GULIEMO / SCIENCE PHOTO LIBRARY
Crystals of white quartz coated with crystals of pinkish-brown topaz. Quartz (silicon oxide) is colourless when pure, but the presence of impurities can give a range of colours including white, pink, yellow, blue, green and smoky brown. Topaz is a silicate of aluminium and fluorine and also occurs in a range of colours including yellow, blue, green, violet, reddish-brown and colourless. Clear or finely-coloured varieties are used as gemstones. This specimen measures 15 x 11 cm and was found in Piraja's Mine, Brumado, Brazil.
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