The rarest stable metal is tantalum.
In terms of abundance in the Earth's crust, the rarest metals are: gold, platinum, osmium, iridium, palladium, ruthenium, rhodium, tellurium and rhenium.
If translated into numbers, platinum—for all of its known deposits—is considerably more rare than gold and is the rarest metal of all. And it is, truly, a gift from the heavens.
Rhodium. Rhodium holds the title of being the most expensive precious metal on the planet.
Rare. The abundance of tungsten in the Earth's crust is thought to be about 1.5 parts per million. Tungsten or Wolfram is considered to be one of the more rare elements.
Painite : Not just the rarest gemstone, but also the rarest mineral on earth, Painite holds the Guinness World Record for it. After its discovery in the year 1951, there existed only 2 specimens of Painite for the next many decades. By the year 2004, there were less than 2 dozens known gemstones.
Tungsten, which is Swedish for "heavy stone," is the strongest metal in the world. It was identified as a new element in 1781. It is commonly used to make bullets and missiles, metal evaporation work, manufacturing of paints, creating electron and Television tubes, and making glass to metal seals.
Platinum in the Earth's crust originates from ultra-mafic igneous rocks. It can therefore be associated with rocks like chromite and olivine. In nature, pure platinum is unknown and well formed crystals are very rare.
When you stare off into the night sky, do you ever think about gold? Here on Earth, we know gold is rare. It's mined from the ground, processed in a gold refinery, and used to make our jewelry, electronics, and even gold crowns and bridges.
"Platinum and Palladium Are 30 Times Rarer Than Gold."
Iridium is one of the rarest elements on Earth. It is found uncombined in nature in sediments that were deposited by rivers. It is commercially recovered as a by-product of nickel refining. A very thin layer of iridium exists in the Earth's crust.
Of the nine precious metals, platinum is considered the most abundance with an abundance estimated to be . 003 parts per billion (ppb). The rest of the metals have a ranking from highest to lowest in terms of abundance.
Rhodium, iridium and ruthenium are perhaps the rarest, roughly 1/5 as common as platinum. However, the sale price of rhodium is typically a bit less than that of platinum, and the rest are even less expensive because they are simply less useful.
Lead is the poorest conductor of heat. It conducts heat very slowly so it acts as an insulator.
Does Aluminium Corrode? While aluminium doesn't rust, it does corrode. The aluminium oxide coating is highly resistant and renews itself if damaged keeping the metal relatively safe from corrosion. But some factors can cause the coat to become unstable, thus exposing the metal.
In general, titanium will usually be more expensive than other metals because it is rarer than other metals, and because it is typically only found bonded to other elements which can make processing more expensive.
Therefore, Cesium is the softest metal.
It is categorized as non-metal because it is an allotrope of carbon that is a poor conductor of heat and electricity, non-malleable and non-ductile, non-reactive, and does not produce oxides.
The scientists found Q-carbon to be 60% harder than diamond-like carbon (a type of amorphous carbon with similar properties to diamond). This has led them to expect Q-carbon to be harder than diamond itself, although this still remains to be proven experimentally.
O is a rare silicate mineral, first described in 1978. It was believed to be named after the Chara River, but due to the river being 70 km away from its discovery place, now it is believed to be named after the Russian word chary, meaning magic or charms.
How rare are rubies? Rubies are one of the rarest gemstones. The rarest rubies come from Burma (Myanmar), due to their high quality and exceptional color. Good quality rubies larger than one carat are also extremely rare—and expensive.
The average concentration of gold in Earth's crust is 'very, very low,' at 4 parts per billion. In its elemental form, gold is significantly rarer than diamonds.