TOM MCHUGH / SCIENCE PHOTO LIBRARY TOM MCHUGH / SCIENCE PHOTO LIBRARY
Gold nugget. Large gold nugget known as 'Tom's Baby'. This nugget, which weighs over 6 kg, was name after the miner Tom Groves who discovered it in Colorado, USA, in 1887. Gold has an atomic number of 79 and has a relative atomic mass of 196.97. It appears in nature as a free metal (known as native gold). Gold forms the basis of monetary systems and is used as jewellery, due to its rarity, attractive appearance and lack of tarnishing. Tom's Baby is the largest nugget ever found in Colorado and is now in the Denver Museum of Natural History, USA.
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