Trinitite, Radioactive Minerals - Updated: September 5, 2016
A number of different types of Trinitite have been identified. Green is the most common form. Black contains iron from the tower structure. Red contains copper from the 'gadget' itself or from the communications cables that led away from the site. Both black and red specimens are extremely rare. Rounded pearls are also found which come from melted silica that returned to solid form before hitting the ground.