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**Formula:** Au
**Atomic number:** 79
**International title:** aurum
**Relative atomic mass:** 196,966 g/mol
**Mohs scale hardness:** 2,5‒3
**Crystal system:** cubic system
**Cell:** Face centred cubic
**Crystal habit:** It often occurs as a free elemental form as nuggets or grains in rocks, veins and alluvial deposits.
**Information:** Gold is chemically resistant with a very good thermal and electrical conductivity, relatively soft and is a yellow precious metal. Gold is a chemically stable element and does not dissolve in conventional acids or bases except in aqua regia.
**Use:** Gold is most commonly used in jewellery, electrical contacts, dentistry and gilding objects from less noble metals.
**Appearance:** It occurs mainly pure.
## Keywords
gold, crystal, metals, mettalurgy
