Ruthenium is most commonly found in ores with other platinum group metals in the mountains of North and South America.
Iridium is a hard silvery-white transition metal that is considered to be the second densest metal on earth.
It’s still considered to be relatively rare, hence the price tag, and has often been used throughout history for coinage, jewelry, and arts.
used to make some of the world’s most expensive jewelry, as well as electronics, groundwater treatment, hydrogen purification, dentistry, and medicine.
Rhodium is used as one of the catalysts in a three-way catalyst converter in automobiles.