Palladium is named after the asteroid Pallas (Greek Pallas, goddess of wisdom), which was discovered at about the same time in 1803. Palladium is a platinum metal and is most commonly found in placer deposits in Russia, North and South America, Ethiopia and Australia. It is also found associated with the nickel-copper deposits of South Africa and Ontario. Palladium is a sheet-white metal, does not tarnish in air, is the least dense and has the lowest melting point of the platinum group of metals. It is typically alloyed and used in the jewelry trades. White gold is an alloy of gold decolorized by the addition of palladium. Like gold, palladium can be beaten into leaf as thin as 1/250,000 in. The metal is used in dentristry, watchmaking and in making surgical intruments and electrical contacts.