uranium
Barium is not a mineral, but is a chemical element. Barium, an alkaline metal, is quite reactive, and it is never found free in nature. Rather, it forms compounds that make up some minerals like barite, which is barium sulfate, and witherite, which is barium carbonate.
Due to its high reactivity, phosphorus is never found as a free element on Earth. Inorganic phosphate rock, which is partially made of apatite is the chief commercial source of this element today.
Sulphur
Flourine is not soluble in water. As an extremely reactive element, it is very difficult to acquire as an unbonded atom. In nature, it may never be found alone from a compound.
Alkali Metals, Alkaline-Earth Metals, and halogens are never found in nature uncombined.
Aluminium is an element, and because of its reactivity is never found as a native element.
Calcium is never found in its elemental form in nature.
Calcium is commonly found in milk and milk products
Neodymium is typically found in minerals such as monazite and bastnäsite. These minerals are primarily mined in countries like China, Brazil, and India. Neodymium is often extracted as a byproduct of rare earth element mining.
its an element, so yes, any thing that's not manufactured by man is natural, therefore found in nature. It is not, however, found unless forced by man; so for most practical purposes it is not found in nature.
Barium is not a mineral, but is a chemical element. Barium, an alkaline metal, is quite reactive, and it is never found free in nature. Rather, it forms compounds that make up some minerals like barite, which is barium sulfate, and witherite, which is barium carbonate.
Phosphorus, a nonmetallic chemical element, is a mineral and never found alone in nature. It is found in washing powder because it is useful for softening water and to prevent pipe corrosion.
Due to its high reactivity, phosphorus is never found as a free element on Earth. Inorganic phosphate rock, which is partially made of apatite is the chief commercial source of this element today.
Sulphur
Flourine is not soluble in water. As an extremely reactive element, it is very difficult to acquire as an unbonded atom. In nature, it may never be found alone from a compound.
How about this: Boron is never found as a free element on Earth.
They're too reactive. They will react with oxygen or moisture in the air, so they can't exist as pure elements unless protected. The usual method is to submerse them in oil.