| Samarium had been discovered as a result of persistent chemical-analytical and spectral research of didimia earth, extracted by Mosander from ceria earth. Several decades after Mosander& |
Lanthanide Samarium crustal abundance is 7x10-4 mass %, in seawater 2.3x10-6 mg/L. Along with other rare earth elements it is contained in monazite, bastnasite (0.7-1.3% of Sm2O3), loparite, and samarskite as well as in gadolinite, orthite etc.
Biological role is not clear, however it is known that samarium stimulates metabolism. It is slightly toxic, as other rare earth elements. |