Holmium is a chemical element with symbol Ho and atomic number 67. Part of the lanthanide series, holmium is a rare-earth element. Holmium was discovered by Swedish chemist Per Theodor Cleve. Its oxide was first isolated from rare-earth ores in 1878.
H 1408 (OTTO) Holmium pieces, 99.9% Cas 7440-60-0 - used as a burnable poison to regulate nuclear reactors. H 1408 (OTTO) Holmium pieces, 99.9% Cas 7440-60-0 - used in the same way as some other rare earths in certain laser and glass-colorant applications.