Yttrogummite is an

yttrium Yttrium is a chemical element with the symbol Y and atomic number 39. It is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a "rare-earth element". Yttrium is almost always found in com ...

-bearing variety of gummite

mineral In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. ( ...

. It is a

rare earth mineral A rare-earth mineral contains one or more rare-earth elements as major metal constituents. Rare-earth minerals are usually found in association with alkaline to peralkaline igneous complexes, in pegmatites associated with alkaline magmas and in o ...

containing relatively large amounts of the yttrium earths. It is an alteration product of yttrian

uraninite Uraninite, formerly pitchblende, is a radioactive, uranium-rich mineral and ore with a chemical composition that is largely UO2 but because of oxidation typically contains variable proportions of U3O8. Radioactive decay of the uranium causes t ...

.Yttrogummite on Mindat.org
It was first described by

Adolf Erik Nordenskiöld Nils Adolf Erik Nordenskiöld (18 November 183212 August 1901) was a Finland-Swedish aristocrat, geologist, mineralogist and Arctic explorer. He was a member of the Fenno-Swedish Nordenskiöld family of scientists and held the title of a friher ...

, who discovered it in

Arendal Arendal () is a List of municipalities of Norway, municipality in Agder counties of Norway, county in southeastern Norway. Arendal belongs to the Districts of Norway, region of Southern Norway, Sørlandet. The administrative centre of the munici ...

Norway Norway, officially the Kingdom of Norway, is a Nordic country in Northern Europe, the mainland territory of which comprises the western and northernmost portion of the Scandinavian Peninsula. The remote Arctic island of Jan Mayen and t ...

in 1870s.Nordenskiöld, A.E. (1878): Mineralogiska bidrag 5. Cleveit, ett nytt yttro-uran mineral från Garta felsspatsbrott nära Arendal. Geologiska Föreningen i Stockholm Förhandlingar, 4: 28-32

References

Uranium minerals Yttrium minerals {{mineral-stub