| In 1794 Johan Gadolin the professor of chemistry at the Royal Academy of Abo, received a sample of mineral found in a quarry in the Swedish village Ytterby near Stockholm, by careful experiments, he isolated a rare earth oxide. Several years later Ekeberg found beryllium in it and called it yttria. Mosander splitting old yttria into three new earths, yttria proper, erbia, and iterbia. Mosander& |
| Lanthanide Gadolinium crustal abundance is 5.4x10-4 mass %, in seawater 6x10-7 mg/L. Along with other rare earth elements it is contained in monazite, bastnasite, in gadolinite, xenotime and apatites. |