Crystal of imperial topaz

Crystal of imperial topaz

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Credit: ROBERTO DE GUGLIEMO/SCIENCE PHOTO LIBRARY

Caption: A crystal of imperial topaz. Topaz is a silicate of aluminium and fluorine and can occur in many colours including yellow, blue, green, violet, reddish-brown and colourless. Clear or finely- coloured varieties are used as gemstones. This specimen measures 14 x 4 cm and was found in Vermelhao's Mine, Ouro Preto, Brazil.

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Keywords: earth science, geology, imperial, imperial topaz, topaz

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