Rare earth minerals…
http://www.miningweekly.com/article/largest-known-rare-earth-mineral-deposit-discovered-2013-12-04/rep_id:3650
https://www.tasnimnews.com/en/news/2018/12/31/1911919/rare-earth-mineral-deposit-can-supply-world-for-centuries
"There are 17 rare-earth elements, which include the 15 elements of the lanthanide series (atomic numbers 57 to 71 on the periodic table), plus scandium (Sc) and yttrium (Y). The heavy rare-earth elements are from gadolinium (Gd) to lutetium (Lu), atomic numbers 64 to 71 on the periodic table."
https://phys.org/news/2018-12-rare-earth-elements-georgia-kaolin.html#jCp
https://investorintel.com/sectors/technology-metals/technology-metals-news/rare-earth-minerals-plc-new-discovery-ree-greenland-licences/