The hull would have consisted of columbium and nickel alloy. For many years, there was confusion over whether columbium and tantalum were the same. The "columbium" discovered by Hatchett was probably a mixture of the new element with tantalum. Hackett named the element Columbium, only being renamed Niobium in 1950. Elsewhere, in the northeast, pegmatite hosts lithium, bismuth, quartz, beryl, columbium, antimony and tantalum. There are also deposits of lithium (world's third largest reserve), beryllium, and columbium. Eventually, Rose's niobium (atomic number 41) was found to be identical to Hatchett's columbium. Niobium is often found in the minerals pyrochlore and columbite, hence the former name "columbium". Alloy of the same name with the designation "Cb-3" indicates columbium stabilized. Niobium, or columbium, is a chemical element with the symbol Nb and atomic number 41.