As metal has the capacity to be molded and melted to a solid object to take the shape of a new coin and from the rounded shape as compared to the non- metal the material must be of a high-grade quality or otherwise it cannot withstand the pressure and durability for making the new coin.
While a metalloid is a type of chemical element which is a mix of metal and a non-metal as boron, silicon, germanium, arsenic and does not show the best properties for the formation into a new coin.
These have various elements and mineral properties involved in their formation.
