ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY
Crystals of native (naturally occuring) gold. Gold is a soft, yellow, malleable transition metal. It is found in veins of quartz, as seen here, or as nuggets scattered through alluvial or glacial deposits. Gold is used in jewellery and dentistry and in electrical contacts and solders. It is chemically unreactive and has the chemical symbol Au. This specimen measures 7 x 6 cm and was found in Morro Velho's Mine, Nova Lima, Brazil.
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