Period 6 element
Platinum is a chemical element with the chemical symbol Pt and an atomic number of 78.
Platinum Koala
On 18 June 1987, the Australian Government approved the minting of platinum and silver coins. This decision was made based on the success of gold coins issued a year earlier. The minting of the coin began in September 1988 in Perth. For marketing purposes, 2 ounce, 10 ounce and 1 kilogram coins of silver, gold and platinum were introduced in 1991; the 1 kg coins were the world's heaviest bullion coins at the time. Together with the American Platinum Eagle, the Platinum Koala is one of the very few series of platinum coins which are still being produced. Minting of 1/10 and 1/2 oz 2010 coins has been announced and will not exceed 2,500 and 1000 pieces, respectively. However, it will be enriched with the new 1/10 and 1/2 oz animal-related platinum coins depicting platypus, frill-necked lizard, saltwater crocodile, wombat, echidna, brolga, dolphin and kangaroo. All these coins have coloured backgrounds.