ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY
Crystals of blue tourmaline. Tourmaline is a complex silicate of aluminium and boron which occurs in many colours including black, brown, blue, green, red and pink. This specimen measures 14 x 5.5 cm and was found in Golconda's Mine, Governador Valadares, Brazil.
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