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Vibranium is a fictional metal in the Marvel Universe, not found in reality. In the comics, it is primarily found in the African nation of Wakanda.
Carbonado, commonly known as the "Black Diamond", is the toughest form of natural diamond. It is an impure form of polycrystalline diamond consisting of diamond, graphite, and amorphous carbon. It is found in alluvial deposits in the Central African Republic and mainly in Brazil.
Diamonds have been found in India, several countries on the African continent, Brazil, Australia and Canada and in USA.
Located in the western African nation of Mali at the edge of the Sahara, Timbuktu was founded by the Tuareg Imashagan in the 11th century.
Carbon can be found formed as a diamond.
Carbon can be found formed as a diamond.
Diamonds are found in India, Australia, Brazil, Canada, Russia and South Africa, plus additional countries on the African continent. It can be said that commercial diamond mining became popular when a volcanic pipe that brought diamonds to the earth's surface, was found near the city of Kimberly, South Africa in 1867. Diamonds are found on every continent on earth except Europe and Antarctica.
According to Wikipedia, below, black diamonds -- properly Carbonado -- are found ". . . in Central African Republic and Brazil."
Some African countries rich in diamonds as a natural resource include Botswana, South Africa, Angola, and the Democratic Republic of Congo. These countries have significant diamond reserves and play a major role in the global diamond industry.