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15. Iridium. Cost: $162.26 per gram. Iridium is a hard, silvery metal that is one of the rarest in the world. It's also extremely corrosion resistant. Iridium is mainly used as a hardening agent ...
As of 2020, the most expensive non-synthetic element by both mass and volume is rhodium. It is followed by caesium, iridium and palladium by mass and iridium, gold and platinum by volume. Carbon in the form of diamond can be more expensive than rhodium. Per-kilogram prices of some synthetic radioisotopes range to trillions of dollars.
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 ...
27. To'ak Chocolate. Cost: $5 per gram and up To’ak Chocolate is the rarest and most valuable in the world. The company sources its cacao from certified Ecuadorian heirloom Nacional cacao pods ...
Osmiridium has been defined as containing a higher proportion of iridium, with iridosmine containing more osmium. However, as the content of the natural Os-Ir alloys varies considerably, the constituent percentages of specimens often reflects the reverse situation of osmiridium describing specimens containing a higher proportion of osmium and ...
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The type locality of this iridium anomaly is near Raton, New Mexico. [1] [2]Iridium is a very rare element in the Earth's crust, but is found in anomalously high concentrations (around 100 times greater than normal) in a thin worldwide layer of clay marking the boundary between the Cretaceous and Paleogene periods, 66 million years ago.
2. Stamps. Stamps, like so many other collectibles, are filled with variables. Condition plays a big part in determining value, as do age and rarity.