ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY
Crystals of pink tourmaline (variety rubellite) growing on a substrate of lepidolite, a type of mica. 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 4 x 2 cm and was found in Jonas' Mine, Conselheiro Pena, Brazil.
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