Palladium is a particularly rare metal. 1 gram is worth $14.50 (Jan 2010 price). If the coin is solid Palladium, then a coin the same weight as a US Quarter would be worth $72.50.

A coin made out of such a material could be worth more to a collector.

Most USSR 25 Ruble coins are palladium. Can you give me a year, a design type or describe the coin? Most of them are worth something, but don't give up your day job.

Palladium hydroxide is milder

Palladium is similar in appearance to white gold, but since it does not have nickel as one of its ingredients, palladium is hypoallergenic. Palladium is considered a lightweight metal, similar in weight to 14K gold. Palladium metal can coat a ring or the ring can be "950 palladium," 95% palladium and 5% ruthenium, with possibly other traces of metal.

Palladium is a metal.