Rare earth; tantalum ta, niobium nb, rhodium rh, iridium ir, palladium pd, cadmium cd, ruthenium ru, etc... .
Tantalum ore.
Coltan, tantalum.
Jet a1, urea, jp54, d2, d6, type b thermal carbon, coltan, tantalum, niobium y tin 62% sn content (raw mineral extracted directly from the mine).