Definition:
Compare niobium with other words:
ilmenium vs. niobium
niobium vs. pelopium
microlite vs. niobium
ferrocolumbite vs. niobium
niobium vs. tantalite
niobium vs. pyrochlore
euxenite vs. niobium
columbite vs. niobium
niobite vs. niobium
niobic vs. niobium
niobate vs. niobium
dianium vs. niobium
columbium vs. niobium