A coin is a piece of hard material , usually metal or alloy, used primarily as a medium of exchange or legal tender. They are standardized in weight, and produced in large quantities at a mint in order to facilitate trade. They are most often issued by a government. 

A bullion coin is a coin struck from precious metal and kept as a store of value or an investment, rather than used in day-to-day commerce.   Bullion coins are usually available in gold and silver, with the exceptions of the Krugerrand and the Swiss Vreneli which are only available in gold.

vCalc's Coins and Bullion library consists of content for computations involved in coins and bullion.