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2. Coinage metals - Wikipedia

   en.wikipedia.org/wiki/Coinage_metals

   Hafnium: Fred Zinkann demo coin. Iridium: 2013 1 ⁄ 25 oz 10 franc bullion coin issued by Rwanda as part of "Noble Five" precious metals set. Molybdenum: Demo coin, Fred Zinkann. 2008 1 tr oz coins by Coins By Design, Murray Buckner (mintage 250). Niobium: Austria has issued a number of bimetallic 25 euro coins with a niobium center.

3. United States Mint coin sizes - Wikipedia

   en.wikipedia.org/wiki/United_States_Mint_coin_sizes

   [1] Seven distinct types of coin composition have been used over the past 200 years: three base coin alloys, two silver alloys, gold, and in recent years, platinum and palladium. The base metal coins were generally alloys of copper (for 2 cent coins and lower), and copper/nickel (for 3 and 5 cent coins). Copper/nickel composition is also used ...

4. Trillion-dollar coin - Wikipedia

   en.wikipedia.org/wiki/Trillion-dollar_coin

   Trillion-dollar coin concept design by artist DonkeyHotey, featuring a similar obverse design to the reverse of the Presidential dollar series. The trillion-dollar coin is a concept that emerged during the United States debt-ceiling crisis of 2011 as a proposed way to bypass any necessity for the United States Congress to raise the country's borrowing limit, through the minting of very high ...

5. List of bullion coins - Wikipedia

   en.wikipedia.org/wiki/List_of_bullion_coins

   Under United States law, coins that do not meet the legal tender requirement cannot be marketed as "coins". Instead, they must be advertised as rounds. [3] Bullion coins are typically available in various weights, usually multiples or fractions of 1 troy ounce, but some bullion coins are produced in very limited quantities in kilograms or heavier.

6. Troy weight - Wikipedia

   en.wikipedia.org/wiki/Troy_weight

   The only troy weight in widespread use is the British Imperial troy ounce and its American counterpart. Both are based on a grain of 0.06479891 gram (exact, by definition), with 480 grains to a troy ounce (compared with 437 + 1 ⁄ 2 grains for an ounce avoirdupois). The British Empire abolished the 12-ounce troy pound in the 19th century.

7. American Gold Eagle - Wikipedia

   en.wikipedia.org/wiki/American_Gold_Eagle

   The 1 ⁄ 10, 1 ⁄ 4, and 1 ⁄ 2 troy oz coins are identical in design to the 1 troy oz coin except for the markings on the reverse side that indicate the weight and face value of the coin (for example, 1 OZ. fine gold~50 dollars). The print on the smaller coins is, therefore, finer and less legible than on larger denominations.

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9. Precious metal - Wikipedia

   en.wikipedia.org/wiki/Precious_metal

   One of the largest bullion coins in the world was the 10,000-dollar Australian Gold Nugget coin minted in Australia, which consists of a full kilogram of 99.9% pure gold. In 2012, the Perth Mint produced a 1-tonne coin of 99.99% pure gold with a face value of $ 1 million AUD, making it the largest minted coin in the world with a gold value of ...