Two of the world's rarest metals are rhodium, which is estimated to be three parts per billion in the universe, and
The rarest stable metal is tantalum. The rarest metal on earth is actually francium, but because this unstable element has a half life of a mere 22 minutes, it has no practical use.
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.
Rhodium. The most expensive and valuable metal in the world is Rhodium.
In terms of abundance in the Earth's crust, the rarest metals are: gold, platinum, osmium, iridium, palladium, ruthenium, rhodium, tellurium and rhenium. These metals are different from Rare Earth Elements, which aren't actually rare in terms of abundance, but are rarely found in concentrated ore deposits.
As the ninth-most abundant element in the Earth's crust, titanium is relatively rare. Research shows the strong and lightweight metal only accounts for roughly 0.63% of the Earth's crust. With such little titanium available, it costs more to harvest and produce than other metals.
Platinum is the purest metal. Platinum is the only precious metal used in fine jewelry that can be 95% pure. Small amounts of iridium and ruthenium (a metal from the platinum family) are commonly added to platinum. The stamp will read PLAT , PT or 950.
Diamonds are much more expensive than gold. However, red diamonds are extremely rare on our planet. Only 30 of them are currently known, and most of them do not weigh more than half a carat (about 0.1 grams). They are worth a lot, and 1 gram can cost around $ 5 million.
Platinum is 30 times more rare than gold. If all the platinum ever mined were melted and poured into an Olympic-sized pool, the platinum would barely reach your ankles.
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.
1. Gold is soluble in mercury, at 200 C., to the extent of about 0.06 per cent; this solubility increases to about 0.25 per cent at 1000 C., and probably decreases to zero at the freezing point of mercury. 2.
Acute/short-term: Osmium tetroxide is generally corrosive and can cause chemical burns to the skin, eyes, and respiratory tract.
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.
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.
#1 Titanium – 42% lighter than steel
As an alloy, titanium is the strongest metal on this list by far. It also has excellent corrosion resistance, performs well at high temperatures, and works well for implants thanks to its high biocompatibility.
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.
Black gold is the same yellow gold, but manufacturers use technology to change the color. Along with black, manufacturers can change gold into a wide range of colors. Different alloying metals produce different shades. Manufacturers mix yellow gold with another metal, often cobalt.
Gold is rare throughout the Universe because it's a relatively hefty atom, consisting of 79 protons and 118 neutrons. That makes it hard to produce, even in the incredible heat and pressure of the 'chemical forges' of supernovae, the deaths of giant stars responsible for creating most chemical elements.
White gold was originally developed to imitate platinum (a naturally white metal). White gold is usually an alloy containing about 75% gold and about 25% nickel and zinc. If stamped 18 karat, it would be 75% pure gold.
Therefore, Cesium is the softest metal.
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.
Tungsten, which is Swedish for "heavy stone," is the strongest metal in the world.