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Tantalum, Niobium and Titanium: Government Issued Physical Investing (coins)

What metals could you physically invest in?
We have all seen Gold, Silver, Platinum and Palladium coins and bars. We have all seen the base metals: copper, zinc, tin, nickel, manganese, aluminum, magnesium and iron based government circulation coins. But what about other precious metals? You can purchase these 3 precious metals, which are the ONLY other precious metals you can buy from a government mint on this planet: tantalum, niobium and titanium. Tantalum and niobium have very high melting points (5463 and 4491 degrees fahrenheit) 5th and 7th highest melting points of all the elements, they are 2 of the 5 refractory metals (retains its strength at high temperatures). Titanium has a extremely low density, is strong and is highly corrosion resistant. These metal coins would make a great addition to any physical metal portfolio, especially if you like to diversify. What if the well known precious metals drop in extreme value? Aluminum was more valuable then gold and silver before 1880!
To invest physically in these metals you can purchase government issued uncirculated coins. Which have a cash value, can be trusted in purity and have very high detail and beauty. These are highly sought after by coin collectors and metal investors.
Tantalum core coins (26.8 grams) with a silver outer ring (14.6 grams) can be purchased. Tantalum is a dense metal. The Kazakhstan government mint issued a Space Series coin. The currency is the Tenge and the amount is 500.
These coins are issued every year since 2005.
These are the only tantalum coins available in the world issued by a government mint.
Niobium core coins with a silver outer ring can be purchased. Different colors of niobium cores are available because of the oxidation process (red, orange, yellow, green, blue, purple and brown). Luxembourg and Austria have issued about 12 niobium core coins and the Latvia government mint has issued 3 niobium core coins.
Titanium coins have been issued by many government mints. The Popjoy Mint ( U.K. government) issued many of them, Austrian government issued at least 2, the Luxembourg government issued at least 3, the Gibraltar government released some titanium coins also.
There are many NON government mints with many other metals available e.g. rhodium and molybdenum. These coins and bars are very inferior in quality, precision and are not legal tender.
Carlo Biancardi ( London, Ontario )